‎Röntgenspektren und periodisches System der Elemente. Mit vier Abbildungen.‎

‎Berlin, Julius Springer, 1923. 8vo. Bound in contemporary half cloth with gilt lettering to spine. In ""Zeitschrift für Physik"", 12 band, 1923. The entire volume offered. Library stamp to title page. Internally a fine and clean copy. Pp. 272-286. [Entire volume: IV, 383 pp.].‎

‎First printing of Bohr's conceptions about atomic structure including electronic orbits. The paper was written in the months during which element 72 was discovered (first named Hafnia, the Latin name for Copehagen, then Danium, and finally the official name became Hafnium), and in the paper, element 72 is mentioned but not named. This is Bohr's first paper with joint authorship.""Element 72 is included, but it is still indicated as unknown. In the second section of the paper a classification is given of the known X-ray spectra of 48 elements, from magnesium to uranium."" (Bohr. Collected Works: The periodic system (1920-1923), p. 33).The volume also contains the following paper by Erwin Schrödinger:""Über eine bemerkenswerte Eigenschaft der Quantenbahnen eines einzelnen Elektrons"" in which he made a new remarkable characteristic of the quanta channnel of a single electron.‎

‎Abhandlungen über Atombau aus dem Jahren 1913-1916. Aut. Deutsche Übers. mit einem Geleitwort von N. Bohr von Hugo stintzing.‎

‎Braunschw., 1921. Cont. hcalf. XX, 156 pp.‎

‎First German edition.‎

‎Abhandlungen über Atombau aus den Jahren 1913-1916.‎

‎Braunschweig, Friedr. Vieweg, 1921. Uncut in orig. printed wrappers. Lower right corner of frontwrapper gone, no loss of text. 2 small nicks in upper part of frontwrapper. Some of the first quires loosening. XX, 156 pp. Internally clean. Backstrip intact.‎

‎A collection of 8 papers by Bohr. First edition of ""Die Anwendung der Quententheorie auf periodische Systeme"" and 7 first translations into German of nearly all Bohr's papers published between 1913 and 1916, beginning with his ""On the Constitution of Atoms and Molecules"". ‎

‎Atomernes Bygning og Stoffernes fysiske og kemiske Egenskaber.‎

‎Copenhagen: Jul. Gjellerup, 1922 8vo. In the original printed wrappers. Offprint from ""Fysisk Tidsskrift, 19"" (1921). Light miscolouring to extremities, lower outer corner of front wrapper bended, otherwise nice and clean. (2), 70 pp.‎

‎First seperate edition of a lecture delivered by Bohr before the Physical Society of Copenhagen on October 18, 1921. In this lecture Bohr attacked the problem of atomic constitution by asking the question: ""How may an atom be formed by the successive capture of the electrons one by one in the field of force surrounding the nucleus?"" The answers are found primarly from an analysis of the observed spectra with quidance from the chemical properties and the correspondance principle. (Collected Works, vol. 4, pp.20). The lecture was quickly translated into German and published in 'Zeitschrift für Physik'‎

‎Atomfysik og menneskelig erkendelse.‎

‎Kbhvn., 1957. Frisk eksemplar med orig. omslag. 124 pp.‎

‎Originaludgavens 1. oplag.‎

‎Atomteorien og Grundprincpperne for Naturbeskrivelsn.‎

‎København, 1930. Orig. bogtrykte omslag. 12 pp. Særtryk af Fysisk Tidsskrift.‎

‎First edition. Offprint from ""Fysisk Tidsskrift"".‎

‎Atomteori og Naturbeskrivelse. 3 Artikler med en indledende Oversigt.‎

‎Kbhvn., 1929. Lex8vo. 83 pp. (Festskrift til Kbhvn's Universitet).‎

‎Originaludgaven.‎

‎Atomteori og Naturbeskrivelse. 3 Artikler med en indledende Oversigt. - [PRESENTATION-COPY]‎

‎Copenhagen, Bianco Lunas, 1929. Royal 8vo. Bound with the original wrappers and the original back-strip in a fine half morocco binding with gilt lettering to spine (Signed ""Ole Olsen 1978 Co´libri""). An exceptionally fine copy. 76 pp.‎

‎First edition of this collection of three articles translated into Danish and appearing as thus for the first time. Inscribed by Bohr (signed ""the author"") on the title-page: ""Hr. Assistent cand. mag. V. Thorsen / med venlig Hilsen / fra Forfatteren"". The work constitutes the first Danish translations of the present three articles: ""Atomic Theory and Mechanics"" (1925, Rosenfeld 33), ""The Quantum Postulate and the Recent Development of Atomic Theory"" (1928, Rosenfeld 37), and ""Wirkungsquantum und Naturbeschreibung"", (1929, Rosenfeld 39), here published together for the first time under the title ""Atomic Theory and the Description of Nature"" and with an introductory overview. The present collection of articles, translated into Danish, Bohr's mother tongue, constitutes an important insight into Bohr's thought and fundamental views on atomic theory and nature. The work, as it is here, has been elected as the Bohr-entry in the official list of Danish canonic literature, which collects the most important literary contributions to Danish culture. This is the only Bohr-item on the list. (see: http://www.kanonudvalget.dk). Rosenfeld, Bohr Bibliography No. 40.‎

‎Atomtheorie und Naturbeschreibung vier aufsätze mit einer einleitenden ubersicht -- EDITION ORIGINALE -- BON EXEMPLAIRE‎

‎Berlin, Springer, 1931, un volume in 8, broché, couverture imprimée, (2), 77pp.‎

‎---- EDITION ORIGINALE ---- BON EXEMPLAIRE ---- "N. Bohr reçut le Prix Nobel de physique en 1922. En 1913, il élabore une théorie de la structure de l'atome rompant radicalement avec les conceptions classiques ---- DSB II pp. 239/254 ---- Einleitende ¥bersicht 1929 mit Addendum 1931 - Atomtheorie und Mechanik 1925 - Das Quantenpostulat und die neuere Entwicklung der Atomistik 1927 - Wirkungsquantum und Naturbeschreibung 1929 - Die Atomtheorie und die Prinzipien der Naturbeschreibung 1929**6642/M2‎

‎Determination of the Surface-Tension of Water by the Method of Jet Vibration. [Offprint from: Philosophical Transactions of the Royal Society of London, Series A, Vol. 209. pp. 281-317.] - [BOHR'S FIRST PUBLISHED PAPER - PRESENTATION COPY]‎

‎(London, Harrison & Sons, 1909). Large 4to. Original printed wrappers" wrappers loose and with lack of paper, mostly to back wrapper, which is quite chipped and nicked, with tears, and lacking a bigger part of the upper right corner. Front wrapper merely lacking a few smaller pieces at the top, not affecting the presentation inscription. Pp. 281-317.‎

‎Extremely scarce first edition, off-print issue with presentation-inscription, of Bohr's first published paper, constituting his only ever work in experimental physics. ""His first research project, a precision measurement of the surface tension of water by the observation of a regularly vibrating jet, was completed in 1906, when he was still a student, and it won him the gold medal from the Academy of Sciences. It is a mature piece of work, remarkable for the care and thoroughness with which both the experimental and theoretical parts of the problem were handled."" (DSB).The work is inscribed to renowned Danish physicist and meteorologist Dan la Cour (1876-1942), son of the great Poul la Cour (1846-1908), who is considered the ""Danish Edison"". The inscription reads as thus: ""Hr. Docent D. la Cour/ ærbødigst/ fra/ Forfatteren."" [In Danish, i.e.: ""Mr. Assistant Professor D. la Cour/ with great respect / from/ the author.""].Dan la Cour was the assistant of Niels Bohr's father, Christian Bohr, and a well known scientist. From 1903, he was head of the department of the Meteorological Institute, and from 1923 leader thereof. From 1908 he was Associate Professor at the Polytechnic College. His original scientific works are highly respected, as are his original apparati for measuring earth magnetism which are considered highly valuable. ""His original intelligence, which in many ways resemble that of his father, also bore fruit in his patenting of various inventions: the ""Pyknoprobe"", developed to quickly determine the different layers of the sea"" a use of termite in quickly heating food and drinks out in the open under unfavourable weather conditions."" (From the Danish Encyclopaedia - own translation). He wrote a number of important and esteemed works and was member of the Danish Scientific Academy as well as many prominent international scientific commissions of meteorology and geophysics (i.e. president of the International Geodetical and Geophysical Union). He was also honorary Doctor at the George Washington University. This Bohr's fist paper grew out of a work which Bohr did in 1906, and for which he won a gold medal from the Academy of Sciences. The subject was to experimentally investigate a method, proposed by Lord Rayleigh, for measuring the surface tension of water by the observation of a regularly vibrating jet. ""Bohr [...] included in his work essential improvements on Rayleigh's theory by taking into account the influence of the liquid's viscosity and of the ambient air, and by extending the earlier theory from infinitesimal to arbitrary large vibration amplitudes. In order to execute his experiments he had first of all to cope with one complication. The university had no physics laboratory."" (Pais, p. 101). Bohr thus constructed many of the instruments himself using his father's laboratory. """"I did the experiments completely alone alone in the physiological laboratory... it was a great amount of work"", which was technically demanding."" (Pais, p. 102). In spite of being Bohr's only ever work in experimental physics, it documents his deep understanding of the methods of experimentalists.""On 23 February 1907 the Academy notified him that he had won its gold medal. In 1908 he submitted a modified version to the Royal Society in London. It was his first and last paper on experiments he himself performed. His second publication was his last to deal with surface tension of liquids"" it was purely theoretical. Both papers were favorably referred to in later literature.The manuscript of the prize essay, never published in its original form, is preserved in the Bohr Archives. It is handwritten, by Harald Bohr [i.e. his brother]."" (Pais, p. 102), Rosenfeld, Bohr Bibliography No. 1. Rosenfeld, Dictionary of Scientific Biography II, pp. 239. Pais, Niels Bohr's Times, pp. 101-02.‎

‎Determination of the Surface-Tension of Water by the Method of Jet Vibration. Offprint from: Philosophical Transactions of the Royal Society of London, Series A, Vol. 209. pp. 281-317. - [BOHR'S FIRST PUBLISHED PAPER - PRESENTATION COPY]‎

‎London, Harrison & Sons, 1909 Large4to. Original printed wrappers. Offprint from: ""Philosophical Transactions of the Royal Society of London, Series A, Vol. 209. pp. 281-317."" With cloth backstrip and I small nick to upper and lower corner of front wrapper. A fine and clean copy. Pp. 281-317.‎

‎Scarce first edition, off-print issue, of Bohr's first published paper, constituting his only ever work in experimental physics. ""His first research project, a precision measurement of the surface tension of water by the observation of a regularly vibrating jet, was completed in 1906, when he was still a student, and it won him the gold medal from the Academy of Sciences. It is a mature piece of work, remarkable for the care and thoroughness with which both the experimental and theoretical parts of the problem were handled."" (DSB).This Bohr's fist paper grew out of a work which Bohr did in 1906, and for which he won a gold medal from the Academy of Sciences. The subject was to experimentally investigate a method, proposed by Lord Rayleigh, for measuring the surface tension of water by the observation of a regularly vibrating jet. ""Bohr [...] included in his work essential improvements on Rayleigh's theory by taking into account the influence of the liquid's viscosity and of the ambient air, and by extending the earlier theory from infinitesimal to arbitrary large vibration amplitudes. In order to execute his experiments he had first of all to cope with one complication. The university had no physics laboratory."" (Pais, p. 101). Bohr thus constructed many of the instruments himself using his father's laboratory. """"I did the experiments completely alone alone in the physiological laboratory... it was a great amount of work"", which was technically demanding."" (Pais, p. 102). In spite of being Bohr's only ever work in experimental physics, it documents his deep understanding of the methods of experimentalists.""On 23 February 1907 the Academy notified him that he had won its gold medal. In 1908 he submitted a modified version to the Royal Society in London. It was his first and last paper on experiments he himself performed. His second publication was his last to deal with surface tension of liquids"" it was purely theoretical. Both papers were favorably referred to in later literature.The manuscript of the prize essay, never published in its original form, is preserved in the Bohr Archives. It is handwritten, by Harald Bohr [i.e. his brother]."" (Pais, p. 102), Rosenfeld, Bohr Bibliography No. 1. Rosenfeld, Dictionary of Scientific Biography II, pp. 239. Pais, Niels Bohr's Times, pp. 101-02.‎

‎Drei Aufsätze über Spektren and Atombau. Mit sieben Abbildungen.‎

‎Braunschw., 1922. Orig.printed wrappers. VIII,148 pp.‎

‎First edition in bookform of ""Ueber die Wasser stoffspektrum"", ""Ueber die Serienspektren der Elemente"", ""der Bau der Atome und die physikalischen und chemischen Eigenschaften der Elemente"" - Rosenfeldt:24.‎

‎Journal of Jocular Physics. Volume III. October 7, 1955. - [""THIS IS THE ATOM THAT BOHR BUILT""]‎

‎Copenhagen, Institute for Theoretical Physics, 1955. Small folio (A4). Blank wrappers, stapled under cloth back-stip. Stenciled manuscript. 48 numbered leaves with printing on rectos only. Illustrated.‎

‎One of the few scarce original stenciled copies of the ""Journal of Jocular Physics, Vol. III,"" the 1955-volume of the privately circulated amateur-comedy-journal that Bohr's students made on the occasions of Bohr's most important birthdays (beginning with his 50th in 1935), in this case his 70th. The ""Journal"" is an eclectic blend of funny and clever stories, songs, poems, aphorisms, humorous descriptions of recent developments in physics, etc., all written in an informal tone with the underlying subject being Bohr's birthday.Since 1929 most of the greatest physicists of the 20th century had been gathering around Niels Bohr for a conference in Copenhagen at the Bohr Institute. Since 1931 this conference had also included a skit prepared by the youngest of the participants, the ""Copenhagen Faust"" of 1932 being the most famous and important of them. It is this skit that later develops into the ""Journal of Jocular Physics"" which was prepared and compiled for Bohr's 50th, 60th and 70th birthdays, the first in 1935, the second in 1945, and the third (the present) in 1955. The 1955 ""Jocular Physics"" was the last of them. ""The early decades of the present century witnessed the heady development of the Quantum Theory of the atom, and during that era the roads of theoreticians of all nationalities led, not to Rome, but to Copenhagen, the home city of Niels Bohr, who was the first to formulate the correct atomic model. It became customary at the end of each spring conference at Blegdamsvej 15 (the street address of Bohr's Institute of Theoretical Physics) to produce a stunt pertaining to recent developments in physics.However Copenhagen was also the home of abundant humor. As a respite from the intensive and highly competitive efforts taking place to characterize fundamental interactions on an atomic scale, physicists took the time to develop satirical letters, articles, plays and other works."" (Gamow, Thirty Years that Shook Physics, pp. 167-68).In his Report at the Niels Bohr Archive Symposium, ""Copenhagen' and beyond: Drama meets history of science"", Yu.V. Gaponov accounts for the history of ""physical art"": ""The 1950s and 1960s were the golden age of the utmost prosperity in Physics. The atomic revolution having opened for the scientists a new world of quanta led soon to the nuclear fission discovery and to the first steps in techniques to dominate the atomic energy. The realization of national atomic programs which first took place in USA and then in Russia (USSR) and Great Britain had attracted the whole world's attention and placed Physics and the natural sciences in general in a top position. Being concerned with matters of physics became then exclusive and prestigious and physicists as individuals attracted the society's attention. They became heroes of literature, theater, movies, press. This process was observed in many advanced countries. It was also typical for the former USSR of those times, although owing to special social circumstances it had acquired some particular forms. One such form was the creation of ""Physical Art"" traditions... The birth of these traditions is commonly associated with the appearance at MSU PhysFac in 1960 of a Student Humor Festival called ""Birthday of Archimedes"" (later ""Physics Day"") along with a comic buffoonery opera ""Archimedes"" (authors - physicists and poets V. Kaner, V. Milyaev). However, MSU physicists consider the ""Physical Art"" traditions to have started earlier. Here are some remarkable milestones: In 1932 the well known ""Faust"" jocular opera and in 1935 the special issue of the ""Jocular Physics"" journal were written by some eminent physicists in connection with the 50th birthday of Niels Bohr.""The present 1955-volume contains numerous very funny contributions by physicists around Bohr, all based on physics humour, physics word-games etc. We have for instance ""A Voyage to Laplacia"" by L. Rosenfeld, a ""Confidential"" report ""Standardization of (physics) Papers"" by J. Lindhard,""Broken English"" by H.B.G. Casimir (""There exists today a universal language that is spoken and understood almost everywhere: it is Broken English. I am not referring to Pidgin English a highly formalized and restricted branch of B.E. but to the much more general language that is used by waiters in Hawai, prostitutes in Paris and ambassadors in Washington, by business-men from Buenos Aires, by scientists at international meetings and by dirty-postcard-peddlers in Greece, in short honourable people like myself all over the world..."" (p. 14), aphorisms (like: ""One Bohr can answer more questions than 10 philosophers can ask"", """"I will have to sleep on that"" the physicist said, he lay down on the floor"", etc.), ""A Remarkable ""V-event"""" by M. Sheep, ""The Heart on the other Side"" by G. Gamow (""""But father will never give his consent... He is looking for a son-in-law who can help him in his business, and eventually take it over. You can't possibly qualify for that, can you?"" ""No, I guess I can't,"" agreed Stan Situs sadly. ""I cannot possibly see how the kind of mathematics I am doing or, in fact, ANY kind of mathematics can help the production and selling of shoes...""), the poem ""The Atom that Bohr Built"", etc. The ""Journal of Jocular Physics"" is an important document portraying both one of the main physical centres of this physically important period and how one of the greatest scientific minds of the 20th century was viewed by his students and collaborators - as being not only brilliant in his field of research but also as a funny, likeable and sympathetic person. See also:Gino Segrè. Faust in Copenhagen. A Struggle for the Soul of Physics and the Birth of the Nuclear Age.""Pimlico, 2008.George Gamow. Thirty Years that Shook Physics. The Story of Quantum Theory. New York, 1966.‎

‎Journal of Jocular Physics. Volume III. October 7, 1955. - [""THIS IS THE ATOM THAT BOHR BUILT""]‎

‎Copenhagen, Institute for Theoretical Physics, 1955. Small folio (A4). Stapled, unbound. Stenciled manuscript. Edges a bit bumped. A bit of spotting to first leaf. 48 numbered leaves with printing on rectos only. Illustrated.‎

‎One of the few scarce original stenciled copies of the ""Journal of Jocular Physics, Vol. III,"" the 1955-volume of the privately circulated amateur-comedy-journal that Bohr's students made on the occasions of Bohr's most important birthdays (beginning with his 50th in 1935), in this case his 70th. The ""Journal"" is an eclectic blend of funny and clever stories, songs, poems, aphorisms, humorous descriptions of recent developments in physics, etc., all written in an informal tone with the underlying subject being Bohr's birthday.Since 1929 most of the greatest physicists of the 20th century had been gathering around Niels Bohr for a conference in Copenhagen at the Bohr Institute. Since 1931 this conference had also included a skit prepared by the youngest of the participants, the ""Copenhagen Faust"" of 1932 being the most famous and important of them. It is this skit that later develops into the ""Journal of Jocular Physics"" which was prepared and compiled for Bohr's 50th, 60th and 70th birthdays, the first in 1935, the second in 1945, and the third (the present) in 1955. The 1955 ""Jocular Physics"" was the last of them. ""The early decades of the present century witnessed the heady development of the Quantum Theory of the atom, and during that era the roads of theoreticians of all nationalities led, not to Rome, but to Copenhagen, the home city of Niels Bohr, who was the first to formulate the correct atomic model. It became customary at the end of each spring conference at Blegdamsvej 15 (the street address of Bohr's Institute of Theoretical Physics) to produce a stunt pertaining to recent developments in physics.However Copenhagen was also the home of abundant humor. As a respite from the intensive and highly competitive efforts taking place to characterize fundamental interactions on an atomic scale, physicists took the time to develop satirical letters, articles, plays and other works."" (Gamow, Thirty Years that Shook Physics, pp. 167-68).In his Report at the Niels Bohr Archive Symposium, ""Copenhagen' and beyond: Drama meets history of science"", Yu.V. Gaponov accounts for the history of ""physical art"": ""The 1950s and 1960s were the golden age of the utmost prosperity in Physics. The atomic revolution having opened for the scientists a new world of quanta led soon to the nuclear fission discovery and to the first steps in techniques to dominate the atomic energy. The realization of national atomic programs which first took place in USA and then in Russia (USSR) and Great Britain had attracted the whole world's attention and placed Physics and the natural sciences in general in a top position. Being concerned with matters of physics became then exclusive and prestigious and physicists as individuals attracted the society's attention. They became heroes of literature, theater, movies, press. This process was observed in many advanced countries. It was also typical for the former USSR of those times, although owing to special social circumstances it had acquired some particular forms. One such form was the creation of ""Physical Art"" traditions... The birth of these traditions is commonly associated with the appearance at MSU PhysFac in 1960 of a Student Humor Festival called ""Birthday of Archimedes"" (later ""Physics Day"") along with a comic buffoonery opera ""Archimedes"" (authors - physicists and poets V. Kaner, V. Milyaev). However, MSU physicists consider the ""Physical Art"" traditions to have started earlier. Here are some remarkable milestones: In 1932 the well known ""Faust"" jocular opera and in 1935 the special issue of the ""Jocular Physics"" journal were written by some eminent physicists in connection with the 50th birthday of Niels Bohr.""The present 1955-volume contains numerous very funny contributions by physicists around Bohr, all based on physics humour, physics word-games etc. We have for instance ""A Voyage to Laplacia"" by L. Rosenfeld, a ""Confidential"" report ""Standardization of (physics) Papers"" by J. Lindhard,""Broken English"" by H.B.G. Casimir (""There exists today a universal language that is spoken and understood almost everywhere: it is Broken English. I am not referring to Pidgin English a highly formalized and restricted branch of B.E. but to the much more general language that is used by waiters in Hawai, prostitutes in Paris and ambassadors in Washington, by business-men from Buenos Aires, by scientists at international meetings and by dirty-postcard-peddlers in Greece, in short honourable people like myself all over the world..."" (p. 14), aphorisms (like: ""One Bohr can answer more questions than 10 philosophers can ask"", """"I will have to sleep on that"" the physicist said, he lay down on the floor"", etc.), ""A Remarkable ""V-event"""" by M. Sheep, ""The Heart on the other Side"" by G. Gamow (""""But father will never give his consent... He is looking for a son-in-law who can help him in his business, and eventually take it over. You can't possibly qualify for that, can you?"" ""No, I guess I can't,"" agreed Stan Situs sadly. ""I cannot possibly see how the kind of mathematics I am doing or, in fact, ANY kind of mathematics can help the production and selling of shoes...""), the poem ""The Atom that Bohr Built"", etc. The ""Journal of Jocular Physics"" is an important document portraying both one of the main physical centres of this physically important period and how one of the greatest scientific minds of the 20th century was viewed by his students and collaborators - as being not only brilliant in his field of research but also as a funny, likeable and sympathetic person. See also:Gino Segrè. Faust in Copenhagen. A Struggle for the Soul of Physics and the Birth of the Nuclear Age.""Pimlico, 2008.George Gamow. Thirty Years that Shook Physics. The Story of Quantum Theory. New York, 1966.‎

‎Les Spectres et la Structure de L'Atome Trois Conferences. Traduit sur le Manuscrit de l'Auteur par A. Corvisy.‎

‎Paris, Libraire Scientifique, 1923. 8vo. Uncut in orig. printed wrappers. Tears to backstrip but preserved. A small nick to upper left corner of frontwrapper.‎

‎First French editions of the three famous papers: ""Ueber die Wasser stoffspektrum"", ""Ueber die Serienspektren der Elemente"", ""Der Bau der Atome und die physikalischen und chemischen Eigenschaften der Elemente"" - Rosenfeld:24.‎

‎Linienspektren und Atombau.‎

‎Leipzig, Johann Ambrosius Barth, 1923. Contemp. full buckram. In: ""Annalen der Physik"", Vierte Folge, band 71. Stamp on verso of titlepage. Portrait as frontisp. (2),605,VI pp. (Entire volume offered). Bohr's paper: pp. 228-288 and 8 plates (on 2 leaves). Punched with cords in inner margins. Clean and fine.‎

‎First appearance of the only part of Bohr's planned new comprehensive treatise on atomic structure, announcing that this was 'the first of a series of essays....on atomic structure'.‎

‎Nyere Undersøgelser over Atomkernernes Omdannelser.‎

‎Oslo, Grøndal & Søn, 1941. 8vo. Offprint from: Fra Fysikkens Verden. Original printed wrappers. Fine condition. 34 pp.‎

‎First edition. ‎

‎On the Constitution of Atoms and Molecules. 3 Parts (all). - [THE BIRTH OF MODERN ATOMIC THEORY (PMM 411)]‎

‎London, Taylor & Francis, 1913. 8vo. Bound together in one very nice recent marbled paper binding with gilt leather title-label to spine. Published in ""The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science"", Vol. 26: July 1913, No. 151 (pp. 1-232 + 6 plates) - September 1913, No 153 (pp. 381-548) - November 1913, No 155 (pp. 802-936 + 6 plates). (The 3 whole numbers of the journal offered). The Bohr papers: pp. 1-25" pp. 476-502 pp.857-875.‎

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‎First edition of Bohr's seminal main work, which constitutes the departure from classical theories" by incorporating Planck's quantum postulate it became possible to calculate the wavelength of the hydrogen emission and thus to explain the regularity of the Balmer-lines.In his previous paper (""On the Theory of Decrease of Velocity of Moving Electrified Particles on passing through Matter"") Bohr had adopted Rutherford's nuclear model of the atom, and had become convinced that it was the peripherical electrons that determined the chemical properties of an element, whereas the nucleus determine the radioactive properties. However, Rutherford's model had an apparent explanatory problem: Why were the negatively charged electrons held away from the positive nucleus? In his doctorial dissertation on the electron theory of metals, Bohr had clarified the limitations of this theory, in particular its ability to explain magnetic properties, and he had shown how this arose from the classical nature of some of its foundations. Bohr strongly expected that the key to solving this problem was to be found in some way of introducing Planck's law of quantum action.In the beginning of 1913 Bohr heard about Rydberg's remarkable discovery in spectroscopy. Rydberg's formula could represent the frequencies of the lines of the hydrogen spectrum in the simplest form in terms of two integers. As soon as Bohr saw this formula, he immediately recognized that it gave him the missing clue to the correct way to introduce Planck's law of quantum of action into the description of the atomic systems. The rest of the academic year was spent reconstructing the whole theory upon the new foundation and expounding it in a large treatise, which was immediately published as these three papers in the 'Philosophical Magazine'. It was in these papers that Bohr first gave his postulates of the orbital structure of the electrons and their quantized radiation.Bohr's atomic theory inaugurated two of the most adventurous decades in the history of science. In 1922 Bohr was awarded the Nobel Prize ""for his services in the investigation of the structure of atoms and of the radiation emanating from them"".Bohr introduced the following postulates: 1. An electron can revolve about its nucleus only in certain special circular orbits. 2. The ordinary electron revolves about its nucleus in an invariable orbit, without radiating or absorbing energy. 3. Radiation takes place when and only when the electron falls from an orbit with greater energy to one of less energy.Rosenfeld, Bohr Bibliography No. 6. Rosenfeld, Dictionary of Scientific Biography II, pp. 240-41. Printing and the Mind of Man: 411.‎

‎On the Quantum Theory of Line-Spectra. Part I-II. [Off-print from ""D. Kgl. Danske Vidensk. Selsk. Skrifter"". - [BOHR'S CORRESPONDENCE PRINCIPLE - PRESENTATION-COPIES]‎

‎Copenhagen, Bianco Lunos, 1918. 4to. Both parts uncut and in the original printed wrappers. Wrappers detached and with small nicks and tears to extremities. Internally fine and clean. Part I unopened. 36 pp. + pp. (37) - 100.‎

‎First editions, author's off-prints (with ""Separate Copy"" printed to front wrappers), presentation-copies, of the first two parts of Bohr's seminal work ""On the Quantum Theory of the Line-Spectra"" (which appeared in three parts and which was never finished, the third part of which, published 4 years later, is almost never found in presentation-sets), in which Bohr gave his first clear presentation of his groundbreaking ""correspondence principle"": ""Which would play a pivotal role in the later development of atomic theory and its transformation into quantum mechanics."" (Kragh, Quantum Generations, p. 56). It eventually became a cornerstone in the quantum mechanics formulated by Heisenberg and Schrödinger. ""There was rarely in the history of physics a comprehensive theory which owed so much to one principle as quantum mechanics owed to Bohr's correspondence principle"" (Jammer 1966, p. 118). The evolution of quantum theory is divided into two distinct periods"" from 1900 to 1925, usually referred to as the period with the old quantum theory still grounded in classical physics and the second period with quantum mechanics from 1925 onwards. The general rules of quantum mechanics are very successful in describing objects on an atomic level. But macroscopic systems are accurately described by classical theories like classical mechanics and classical electrodynamics. If quantum mechanics were to be applicable to macroscopic objects, there must be some limit in which quantum mechanics reduces to classical mechanics. Bohr's correspondence principle demands that classical physics and quantum physics give the same answer when the systems become large. ""A major tool he developed for dealing with quantum problem, [...], was the correspondence principle, which establishes links between predictions of the classical theory and expectations for the quantum theory."" (Pais, Niels Bohr's Times, p. 20.). In this sense, the correspondence principle is not only an exceedingly important methodological principle, it also represents the transition to quantum mechanics and modern physics in general and it became the cornerstone of Bohr's philosophical interpretation of quantum mechanics which later would be closely tied to his thesis of complementarity and to the Copenhagen interpretation. Another version of the correspondence principle lives on in philosophical literature where it has taken form as a more general concept representing a development of new scientific theories.""By 1918 Bohr had visualized, at least in outline, the whole theory of atomic phenomena. ... He of course realized that he was still very far from a logically consistent framework wide enough to incorporate both the quantum postulates and those aspects of classical mechanics and electrodynamics that seemed to retain some validity. Nevertheless, he at once started writing up a synthetic exposition of his arguments and of all the evidence upon which they could have any bearing" in testing how well he could summarize what was known, he found occasion to check the soundness of his ideas and to improve their formulation. In the present case, however, he could hardly keep pace with the growth of the subject the paper he had in mind at the beginning developed into a four-part treatise, 'On the Theory of Line Spectra', publication of which dragged over four years without being completed" the first three parts appeared between 1918 and 1922 [of which the two first from 1918 are offered here], and the fourth, unfortunately, was never published. Thus, the full impact of Bohr's view remained confined to the small but brilliant circle of his disciples, who indeed managed better than their master to make them more widely known by the prompter publication of their own results"" (D.S.B. II: 246-47).Inscribed to ""Hr. Docent D. la Cour/ Venskabeligst/ fra/ Forfatteren"" on both front wrappers. The renowned Danish physicist and meteorologist Dan la Cour (1876-1942), was the son of the great Poul la Cour (1846-1908), who is considered the ""Danish Edison"". Dan la Cour was the assistant of Niels Bohr's father, Christian Bohr, and a well known scientist. From 1903, he was head of the department of the Meteorological Institute, and from 1923 leader thereof. From 1908 he was Associate Professor at the Polytechnic College. His original scientific works are highly respected, as are his original apparati for measuring earth magnetism which are considered highly valuable. ""His original intelligence, which in many ways resemble that of his father, also bore fruit in his patenting of various inventions: the ""Pyknoprobe"", developed to quickly determine the different layers of the sea"" a use of termite in quickly heating food and drinks out in the open under unfavourable weather conditions."" (From the Danish Encyclopaedia - own translation). He wrote a number of important and esteemed works and was member of the Danish Scientific Academy as well as many prominent international scientific commissions of meteorology and geophysics (i.e. president of the International Geodetical and Geophysical Union). He was also honorary Doctor at the George Washington University. Rosenfeld, Bohr-Bibliography, 15.‎

‎On the Quantum Theory of Line-Spectra, Part I - III. - [BOHR'S CORRESPONDENCE PRINCIPLE]‎

‎København, Bianco Lunos Bogtrykkeri, 1918 - 1922. 4to. Uncut unopened in the original printed wrappers. In ""D. Kgl. Danske Vidensk. Selsk. Skrifter, afd., 8, række IV, 1-3"" / ""Mémoires de l'Académie Royale des Sciences et des Lettres de Danemark"". Wrapper with a few minor nicks and tears but otherwise a very fine and clean copy. 118 pp.‎

‎Collected offprint-edition of Bohr's seminal work ""On the Quantum Theory of the Line-Spectra"", marking the beginning of the quantum revolution in physics, introduced the concept of quantized energy levels, provided an explanation for the observed line spectra, and served as a foundational model that inspired further developments in quantum mechanics. It is conseidered one of Bohr's most important papers and the basis for his Nobel Prize. These papers give the first clear formulation of his 'correspondence principle' establishing the limit agreement of quantum and classical physics. ""By 1918 Bohr had visualized, at least in outline, the whole theory of atomic phenomena. ... He of course realized that he was still very far from a logically consistent framework wide enough to incorporate both the quantum postulates and those aspects of classical mechanics and electrodynamics that seemed to retain some validity. Nevertheless, he at once started writing up a synthetic exposition of his arguments and of all the evidence upon which they could have any bearing" in testing how well he could summarize what was known, he found occasion to check the soundness of his ideas and to improve their formulation. In the present case, however, he could hardly keep pace with the growth of the subject the paper he had in mind at the beginning developed into a four-part treatise, 'On the Theory of Line Spectra', publication of which dragged over four years without being completed" the first three parts appeared between 1918 and 1922, and the fourth, unfortunately, was never published. Thus, the full impact of Bohr's view remained confined to the small but brilliant circle of his disciples, who indeed managed better than their master to make them more widely known by the prompter publication of their own results"" (D.S.B. 2: 246-47).‎

‎On the Quantum Theory of Line-Spectra. Part I-III.‎

‎K., 1918-22. (Unchanged reprint of the original. Coph., 1928). 4to. 118 pp.‎

‎On the Quantum Theory of Line-Spectra. Part II, On the Hydrogen Spectrum. - [AUTHOR'S OFFPRINT - PRESENTATION-COPY]‎

‎Copenhagen, Bianco Lunos, 1918. 4to. Original printed wrappers. Lower right corner of front wrapper bent. Small closed tear to front wrapper. Spine strip renewed. Otherwise fine and clean throughtout. ‎

‎First printing of the second part of Bohr's seminal work ""On the Quantum Theory of the Line-Spectra"" (which appeared in three parts and which was never finished), author's off-print (with ""Separate copy"" printed on front wrapper), presentation-copy, inscribed by Bohr: ""Hr. Professor K. Prytz / med venlig Hilsen / fra Forfatteren"".""By 1918 Bohr had visualized, at least in outline, the whole theory of atomic phenomena. ... He of course realized that he was still very far from a logically consistent framework wide enough to incorporate both the quantum postulates and those aspects of classical mechanics and electrodynamics that seemed to retain some validity. Nevertheless, he at once started writing up a synthetic exposition of his arguments and of all the evidence upon which they could have any bearing" in testing how well he could summarize what was known, he found occasion to check the soundness of his ideas and to improve their formulation. In the present case, however, he could hardly keep pace with the growth of the subject the paper he had in mind at the beginning developed into a four-part treatise, 'On the Theory of Line Spectra', publication of which dragged over four years without being completed" the first three parts appeared between 1918 and 1922 [of which the second from 1918 is offered here], and the fourth, unfortunately, was never published. Thus, the full impact of Bohr's view remained confined to the small but brilliant circle of his disciples, who indeed managed better than their master to make them more widely known by the prompter publication of their own results"" (D.S.B. 2: 246-47).The present second part deals with the hydrogen spectrum, whereas the first part dealt with the general theory, and the third with the spectra of elements of higher atomic structure. Peter Kristian Prytz (1851-1929), to whom the work is inscribed, was an important physicist of the generation before Bohr. He did immense work to better the conditions of the teaching of physics at the Polytechnic Institute in Copenhagen, where Bohr studied for many years and where he later became a teacher. Prytz introduced the teaching of experimental physics here and fought for more space, more apparatus, more money for teaching assistance and more time for teaching. Thus, he played a great role in the physics-environment in Copenhagen both during Bohr's years as a student and as a teacher.Most importantly, it was Prytz who (in 1907) attracted the necessary money for the institute which enabled him to create the physical laboratory that constituted the foundation of Danish experimental physics, the field of which Bohr became professor in 1916 (till 1920 - the years during which he was working on the ""On the Quantum Theory of the Line Spectra"").Rosenfeld, Bohr-Bibliography, 15.‎

‎On the Theory of Decrease of Velocity of Moving Electrified Particles on passing through Matter. In: Philosophical Magazine Vol. 25, No. 145, January 1913 pp. 10-31. - [BOHR'S FIRST WORK ON NUCLEAR PHYSICS]‎

‎London, Taylor & Francis, 1913. 8vo. Original printed wrappers" chipped, backstrip lacks. The whole issue. 200 pp., 2 plates.‎

‎First edition of Bohr's first work on nuclear physics, published just before his 'On the Constitution of Atoms and Molecules'. During his visit to Manchester Bohr had the chance to get a first hand account of Rutherford's investigations on the penetration of alpha-particles through matter. In order to explain the large-angle scattering of alpha rays, which Rutherford had observed, he proposed his ""nuclear"" model of the atom in contrast to J.J. Thomson's ""plum pudding"" model in 1910. Bohr eagerly took up the new model and soon recognized its far-reaching implications. In particular, he pointed out that the nuclear model of the atom implied a sharp separation between the chemical properties, ascribed to the peripherical electrons, and the radioactive properties, which affected the nucleas itself. In this paper the theory of the decrease of velocity of moving electrified particles in passing through matter is given in a form, such that the rate of the decrease in the velocity depends on the frequency of vibration of the electrons in the atoms of the absorbing material. In the conclusion Bohr could state 'that a hydrogen atom contains only 1 electron outside the positively charged nucleas, and that a helium atom only contains 2 electrons outside the nucleas'.Rosenfeld, Bohr Bibliography No. 5. Rosenfeld, Dictionary of Scientific Biography II, pp. 240-41. ‎

‎On the Theory of Decrease of Velocity of Moving Electrified Particles on passing through Matter - [THE FOUNDATION OF BOHR'S ATOMIC THEORY]‎

‎London, Taylor & Francis, 1913. 8vo. Bound in one nice contemporary half calf binding with gilt leather title-label to spine. Published in ""The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science"", Vol. 25. No. 145-150 offered. Small repair to spine and blind stamped to lower part of title page. The Bohr papers: pp. 10-31. [Entire volume: VIII, 876 pp.+ 10 plates].‎

‎Bohr's seminal first work on nuclear physics, being the work that lays the foundation for his atomic theory (published before his ""On the Constitution of Atoms and Molecules""), in which he is able to conclude ""that a hydrogen atom contains only 1 electron outside the positively charged nucleus, and that a helium atom only contains 2 electrons outside the nucleus ."" ""Bohr's 1913 paper on alpha-particles [i.e. the present], which he had begun in Manchester, and which had led him to the question of atomic structure, marks the transition to his great work, also of 1913, on that same problem. While still in Manchester, he had already begun an early sketch of those entirely new ideas."" (Pais, p. 128). The present work must be considered one of the most important to the birth of modern atomic theory.After finishing his studies in Copenhagen, Bohr went to Cambridge in order to pursue his studies on electron theory under the guidance of J.J. Thompson. Thompson, who was beginning to lose interest in the subject by now, did, however, not recognize the genious of the young Bohr, and as soon as he could, Bohr went to Manchester, where Ernest Rutherford had established a laboratory. ""There, from March to July 1912, working with utmost concentration, he [i.e. Bohr] laid the foundation for his greatest achievements in physics, the theory of the atomic constitution."" (DSB). Bohr's survey of the implications of Rutherford's atomic model had led him to attack the much harder problem which lay at the core of it, namely determining the exact nature of the relation between the atomic number and the number of electrons in the atom. ""Bohr obtained a much deeper insight into the problem by a brilliant piece of work, which he - working, as he said, ""day and night"" - completed with astonishing speed"" (DSB), that paper being the present ""On the Theory of the Decrease of Velocity of Moving electrified Particles on passing through Matter"", which thus constitutes his very first publication on the subject, published immediately after this dense period of 1912, in the Philosophical Magazine of January 1913. ""The problem was one of immediate interest for Rutherford's laboratory: in their passage through a material medium, alpha particles continually lose energy by ionizing the atoms they encounter, at a rate depending on their velocity. Their energy loss limits the depth to which the particles can penetrate into the medium, and the relation between this depth, or range, and the velocity offers a way of determining this velocity. What Bohr did was to analyze the ionizing process on the basis of the Rutherford model of the atom and thus express the rate of energy loss in terms of the velocity by a much more accurate formula than had so far been achieved-a formula, in fact, to which modern quantum mechanics adds only nonessential refinements"" (DSB). In the present work, Bohr was thus able to conclude: ""In this paper the theory of the decrease of velocity of moving electrified particles in passing through matter is given in a form, such that the rate of the decrease in the velocity depends on the frequency of vibration of the electrons in the atoms of the absorbing material."" as well as the seminal words that have been formative for the birth of the modern atomic theory: ""Adopting Prof. Rutherford's theory of the constitution of atoms, it seems that it can be concluded with great certainty, from the absorption of alpha-rays, that a hydrogen atom contains only 1 electron outside the positively charged nucleus, and that a helium atom only contains 2 electrons outside the nucleus "". Bohr continues: ""These questions and some further information about the constitution of atoms which may be got from experiments on the absorption of alpha-rays, will be discussed in more detail in a later paper."" (pp. 30-31 of the original paper) - the last sentence referring directly to his three part ""On the Constitution of Atoms and Molecules"", in which he went on to present his postulates of the orbital structure of the electrons and their quantized radiation. Rosenfeld, Bohr Bibliography No. 5. Rosenfeld, Dictionary of Scientific Biography II, pp. 240-41. Pais, Niels Bohr's Times, pp. 117-31.‎

‎On the Theory of the Decrease of Velocity of Moving Electrified Particles on passing through Matter. [Off-print From the Philosophical Magazine (Vol. 25, No. 145) for January 1913 ]. - [THE FOUNDATION OF BOHR'S ATOMIC THEORY - PRESENTATION-COPY]‎

‎[London, Taylor & Francis], 1913. 8vo. Original printed wrappers. The fragile wrappers are detached, but fully intact. Merely tiny parts of the thin backstrip lacking. Three small tears to front wrapper, no loss, as well as a couple of creses. Back wrapper with a slight bend to the corner and minor fading to extremities. Pp. (9)-31.‎

5 Images

‎Scarce first edition, off-print issue with presentation-inscription, of Bohr's seminal first work on nuclear physics, being the work that lays the foundation for his atomic theory (published before his ""On the Constitution of Atoms and Molecules""), in which he is able to conclude ""that a hydrogen atom contains only 1 electron outside the positively charged nucleus, and that a helium atom only contains 2 electrons outside the nucleus ."" ""Bohr's 1913 paper on alpha-particles [i.e. the present], which he had begun in Manchester, and which had led him to the question of atomic structure, marks the transition to his great work, also of 1913, on that same problem. While still in Manchester, he had already begun an early sketch of those entirely new ideas."" (Pais, p. 128). The present work must be considered one of the most important to the birth of modern atomic theory.The work is inscribed to renowned Danish physicist and meteorologist Dan la Cour (1876-1942), son of the great Poul la Cour (1846-1908), who is considered the ""Danish Edison"". The inscription reads as thus: ""Hr. Docent Afdelingschef D. la Cour/ med venlig Hilsen/ fra/ Forfatteren."" [In Danish, i.e.: ""Mr. Assistant Professor Head of Department D. la Cour/ with kind regards/ from/ the author.""].Dan la Cour was the assistant of Niels Bohr's father, Christian Bohr, and a well known scientist. From 1903, he was head of the department of the Meteorological Institute, and from 1923 leader thereof. From 1908 he was Associate Professor at the Polytechnic College. His original scientific works are highly respected, as are his original apparati for measuring earth magnetism which are considered highly valuable. ""His original intelligence, which in many ways resemble that of his father, also bore fruit in his patenting of various inventions: the ""Pyknoprobe"", developed to quickly determine the different layers of the sea"" a use of termite in quickly heating food and drinks out in the open under unfavourable weather conditions."" (From the Danish Encyclopaedia - own translation). He wrote a number of important and esteemed works and was member of the Danish Scientific Academy as well as many prominent international scientific commissions of meteorology and geophysics (i.e. president of the International Geodetical and Geophysical Union). He was also honorary Doctor at the George Washington University. After finishing his studies in Copenhagen, Bohr went to Cambridge in order to pursue his studies on electron theory under the guidance of J.J. Thompson. Thompson, who was beginning to lose interest in the subject by now, did, however, not recognize the genious of the young Bohr, and as soon as he could, Bohr went to Manchester, where Ernest Rutherford had established a laboratory. ""There, from March to July 1912, working with utmost concentration, he [i.e. Bohr] laid the foundation for his greatest achievements in physics, the theory of the atomic constitution."" (DSB). Bohr's survey of the implications of Rutherford's atomic model had led him to attack the much harder problem which lay at the core of it, namely determining the exact nature of the relation between the atomic number and the number of electrons in the atom. ""Bohr obtained a much deeper insight into the problem by a brilliant piece of work, which he - working, as he said, ""day and night"" - completed with astonishing speed"" (DSB), that paper being the present ""On the Theory of the Decrease of Velocity of Moving electrified Particles on passing through Matter"", which thus constitutes his very first publication on the subject, published immediately after this dense period of 1912, in the Philosophical Magazine of January 1913. ""The problem was one of immediate interest for Rutherford's laboratory: in their passage through a material medium, alpha particles continually lose energy by ionizing the atoms they encounter, at a rate depending on their velocity. Their energy loss limits the depth to which the particles can penetrate into the medium, and the relation between this depth, or range, and the velocity offers a way of determining this velocity. What Bohr did was to analyze the ionizing process on the basis of the Rutherford model of the atom and thus express the rate of energy loss in terms of the velocity by a much more accurate formula than had so far been achieved-a formula, in fact, to which modern quantum mechanics adds only nonessential refinements"" (DSB). In the present work, Bohr was thus able to conclude: ""In this paper the theory of the decrease of velocity of moving electrified particles in passing through matter is given in a form, such that the rate of the decrease in the velocity depends on the frequency of vibration of the electrons in the atoms of the absorbing material."" as well as the seminal words that have been formative for the birth of the modern atomic theory: ""Adopting Prof. Rutherford's theory of the constitution of atoms, it seems that it can be concluded with great certainty, from the absorption of alpha-rays, that a hydrogen atom contains only 1 electron outside the positively charged nucleus, and that a helium atom only contains 2 electrons outside the nucleus "". Bohr continues: ""These questions and some further information about the constitution of atoms which may be got from experiments on the absorption of alpha-rays, will be discussed in more detail in a later paper."" (pp. 30-31 of the original paper) - the last sentence referring directly to his three part ""On the Constitution of Atoms and Molecules"", in which he went on to present his postulates of the orbital structure of the electrons and their quantized radiation. Rosenfeld, Bohr Bibliography No. 5. Rosenfeld, Dictionary of Scientific Biography II, pp. 240-41. Pais, Niels Bohr's Times, pp. 117-31.‎