‎BARBUSSE Henri‎
‎LIGHT‎

‎Announcing his discovery of ultraviolet light ""Von den Herren Ritter und Bückmann. - - Am 22sten Febr. habe ich auch auf der Seite des Violetts im Farbespectrum, ausserhalb desselben, Sonnenstrahlen angetroffen....‎

‎Halle, Rengerschen Buchhandlung, 1801. Without wrappers as published in ""Annalen der Physik. Herausgegeben von Ludwig Wilhelm Gilbert"", Bd. 7, Viertes Stück. The entire issue offered (=Heft 4). Pp. 387-528. Ritter's announcement p. 525. With titlepage to volume 7. Clean and fine. Titlepage a bit shavedin inner margin.‎

‎First printing of Ritter's announcement of his discovery of ultraviolet light in a halfpage letter addressed to Gilbert's Annalen. With that discovery, it became clear that visible light represents no more than a fraction of a continous spectrum.A year earlier, in 1800, William Herschel discovered infrared light. This was the first time that a form of light beyond visible light had been detected. After hearing about Herschel's discovery of an invisible form of light beyond the red portion of the spectrum, Ritter decided to conduct experiments to determine if invisible light existed beyond the violet end of the spectrum as well. He had heard that blue light caused a greater reaction in silver chloride than red light did. Ritter decided to measure the rate at which silver chloride reacted to the different colors of light. He directed sunlight through a glass prism to create a spectrum. He then placed silver chloride in each color of the spectrum and found that it showed little change in the red part of the spectrum, but darkened toward the violet end of the spectrum. Johann Ritter then decided to place silver chloride in the area just beyond the violet end of the spectrum, in a region where no sunlight was visible. To his amazement, this region showed the most intense reaction of all. This showed for the first time that an invisible form of light existed beyond the violet end of the visible spectrum. This new type of light, which Ritter called Chemical Rays, later became known as ultraviolet light or ultraviolet radiation (the word ultra means beyond). - Parkinson, Breakthroughs: 1801 P.‎

‎Om Identiteten af Lyssvingninger og elektriske Stømme. (On the Identity of the Vibrations of Light with electrical Currents).‎

‎(København, 1867). Contemp. marbled clothbacked boards. Titlelabel with gilt lettering on upper cover. Pp. 26-45. Extracted from ""Oversigt over det Kgl. danskeVidenskabernes Selskabs Forhandlinger 1867, Nr. 1"".‎

‎Extremely scarce first edition of the paper in which Lorenz, independent of Maxwell, stated that light is electromechanical in nature, probably inspired by his former teacher H. C. Oersted, the discoverer of electromagnetism and professor at the Polytechnic College, he aimed at unifying the forces of nature without introducing new physical hypotheses. ""The idea that the various forces in nature are merely different manifestations of the one and same force has proved itself more fertile than all physical theories"".Most impressive of all Lorenz’ achievements in optics is his electromagnetic theory of light, developed in a relatively unknown paper of 1867, two years after Maxwell’s famous paper on the same subject. At that time Lorenz did not know Maxwell’s theory, and his own approach was quite different. Lorenz’ electromagnetic theory of light can be described briefly as an interpretation of the light vector as the current density vector in a medium obeying Ohm’s law. This paper contains the fundamental equations for the vector potential and the scalar potential or - for the first time - the corresponding retarded potentials expressed in terms of the current density vector and the electrical charge density. The concept of retarded potentials had already been introduced in an earlier paper by Lorenz in connection with research on the theory of elasticity. He found that the differential equation for the current density vector was the same as his fundamental wave equation for the light vector, completed with a term which explains the absorption of light in conducting media, and that his theory led to the correct value for the velocity of light."" (Mogens Pihl in DSB).The paper was published in English, 1867 ""On the identity of the vibrations of light with electrical currents."" (Philosophical Magazine 34: 287-301) and also in German in ""Annalen der Physik""‎

‎The Pressure of Light , The Roman of Science Series‎

‎Society for Promoting Christian Knowledge - SPCK, London and E.S. Gorham, New York Malicorne sur Sarthe, 72, Pays de la Loire, France 1910 Book condition, Etat : Très Bon hardcover, editor's full red printed clothes, illustrated by a figure In-8 1 vol. - 111 pages‎

‎42 text-figures in black and white 1st Edition, 1910 Contents, Chapitres : Preface (July 1910), Contents, viii, Text, 103 pages and catalogue, 8 pages - How light exerts pressure - Experiments on the pressure of light falling perpendicularly on a surface - Experimnts on the pressure of light against the source from which it issues, the recoil from light - Experiments illustrating the carriage of momentum by a beam of light - The pressure of light in astronomy, some possible consequences - Notes : Light-pressure on the corpuscule theory - The pressure due to waves issuing normally from a surface - The pressure of a beam incidient normally on a perfectly reflecting surface - The light force at a refracting surface - The pressure of sunlight against an absorbing sphere compared with the gravitation pull - The amount of matter which can be pushed out by the pressure of sunlight - The resisting force on a sphere moving round the sun and radiating r per sq. cm. per second, and the reduction of its orbit round the sun - John Henry Poynting (9 septembre 1852 30 mars 1914) est un physicien anglais qui a travaillé, entre autres, sur les ondes électromagnétiques. Il a été professeur de physique au Mason Science College (qui devient plus tard l'Université de Birmingham) de 1880 jusqu'à sa mort. - Il a défini ce que l'on appelle le vecteur de Poynting qui représente la puissance par unité de surface que transporte une onde électromagnétique et la direction de ce flux d'énergie. Ce vecteur est utilisé dans le théorème de Poynting, qui établit la conservation d'énergie des champs électriques et magnétiques. Il a mesuré la constante gravitationnelle de Newton par des techniques novatrices en 1893. En 1903, il est le premier à réaliser que la radiation solaire peut attirer les petites particules vers le Soleil, effet reconnu plus tard sous le nom d'effet Poynting-Robertson. Pendant l'année 1884, il analyse les prix des bourses de commerce, notamment ceux du blé, de la soie, et du coton, à l'aide de méthodes statistiques. Des cratères sur Mars et sur la Lune ont été nommés en son honneur, de même que le bâtiment principal de physique de l'université de Birmingham et l'association du département de physique de celle-ci, la Poynting Physical Society. (source : Wikipedia) near fine copy, the editor's binding is fine, with a very minor wear on the bottom of the front part, quite nothinh, no dust-jacket supposingly as issue, inside is fine, no markings, a rather nice copy of this interesting and original text on the pressure of light, original copy, 1910‎

‎Lukomsky A.S. (gene-light), Lechovich V.A. (gene-light), Bogatko N.O. (gene-ligh‎

‎Lukomsky A.S. (gene-light), Lechovich V.A. (gene-light), Bogatko N.O. (gene-light), Naumov A.N., Ronzhin S.A. (gene-light), Hermonius E.K. (gene-light), Khrabrov N.M. (gene-light), Substitute K.E., Uget S.A. A collection of notes relating to Russian supplies during the Great War. In Russian (ask us if in doubt)/Lukomskiy A.S.(gen-leyt.), Lekhovich V.A.(gen-leyt.), Bogatko N.O.(gen-leyt.), Naumov A.N., Ronzhin S.A.(gen-leyt.), Germonius E.K.(gen-leyt.), Khrabrov N.M.(gen.-mayor), Zamen K.E., Uget S.A. Sbornik zapisok, otnosyashchikhsya k russkomu snabzheniyu v Velikuyu Voynu. Short description: In Russian (ask us if in doubt).Published, apparently, for the US Department of State, not for sale. Very small print run. Huge quantity of statistical data. Printed on a rotator. Very rare (Andrei Savin # 5993). Financial Agency Abroad. 1925. VIII, 366 pages. We have thousands of titles and often several copies of each title may be available. Please feel free to contact us for a detailed description of the copies available. SKUalbe52296b6db0ce45f‎

‎Essai d'une Explication physique des Couleurs engendrees sur des Surfaces extrémement minces. (Essay concerning the physical explanation of colors which are issued from extremely thin surfaces). - [EULER'S WAVE-THEORY OF LIGHT]‎

‎(Berlin, Haude et Spener, 1754). 4to. Without wrappers as extracted from ""Mémoires de L'Academie Royale des Sciences et belles Lettres"", Tome VIII, pp. 262-282.‎

‎First printing of Eulers's importent paper in which he defended the wave-theory of light in opposition to the newtonian corpuscular hypothesis.Most of the scientists and philosophers of the 18th century defended the corpuscular theory of light, but Euler ""being impressed by the notion that the emission of particles would cause a diminuation in the mass of the radiating body, which was not observed, while the emission of waves involved no such consequence...he insisted strongly on the resamblance between light and sound" the whole of the space through which the heavenly bodies move is filled with a subtle matter, the aether, and light consists in vibrations of this aether 'light is the same thing as sound in air'....The chief novelty of Euler's writings on light is his explanation of the manner in which material bodies appear coloured when wieved with white light" and, in particular the way in which colours of thin plates are produced."" (Whittaker,A History of the Theories of Aether and Electricity: pp. 97-98.). - Euler's worg comes here together with a paper by L'Abbe Mazeas on ""Observations sur les Coleurs engendres par le Frottement des Surfaces plane et transparentes."". - Enestrom E:209.‎