‎[Longmans, Green and Co] - ‎ ‎TYNDALL, John‎
‎Sound‎

‎Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems. [British Patent] Number: 394,325. [Date of Application, 14th December, 1931. No. 34,657 / 31 - Complete left: Nov. 10, 1932. Complete accepted, 14th Jun... - [THE INVENTION OF STEREO]‎

‎[London, Eyre and Spottiswoode], 1933, 14th June. 8vo. Disbound. Stamp to p. 1. 22 p + 1 folded plate.‎

‎Scarce original printed patent for the world's first stereo sound-recording system thus revolutionizing music recordings, radio broadcasting and cinematographic recordings. The present patent is considered ""a bible for sound engineers [and] it pre-empts all further useful reasoning on the subject"" (New Scientist). ""It is a classic patent in the history of electrical engineering"" (British Library, Patent Blog)"" it was more than a century ahead of its time, as stereo recordings did not become the standard until the 1950'ies. Blumlein furthermore anticipated many of the thoughts and techniques behind Dolby Pro-Logic. Blumlein's patent is not only a milestone in the history of engineering, unlike most other patents it reads like a text book and is still by most sound engineers considered the best source text on how stereo works.On several occasions, Blumlein explained that a blind person sitting in the cinema would be able to point out exactly where the actor was on the screen with his system. He called this system 'Binaural Sound', from the human factor of having two ears by which we hear sound. Today it is better known as Stereophonic or 'Stereo' Sound.""In 1931 Blumlein's GB 394325 was applied for by Electric and Musical Industries Limited, later better known as EMI. It enabled the first single track, two channel gramophone recordings. It is a classic patent in the history of electrical engineering, and has the then extraordinary number of 70 claims (half a dozen was normal at the time). The story goes that he thought of the basic idea when he and his wife were at the cinema. The early ""talkies"" had a single set of speakers which meant that the actor might be on one side of the screen while his voice seemed to come from the other side. Blumlein declared to his wife that he had found a way to make the sound follow the actor across the screen.Blumlein is credited with 128 patents in a working life of 18 years (he was only 38 when he died, while engaged in radar experiments in a Halifax bomber). A true polymath, he worked in virtually every field of electrical engineering."" (British Library). ""The work conducted at E.M.I. is best preserved through the writings of one its researchers and one the founding fathers of stereo recording, Alan D. Blumlein. The patents of Blumlein, especially the classic ""Specification 394,325"" accepted in 1933, still inform and challenge theorists and recording TdC-6 techniques to this day. Blumlein's basic approach to stereo relied on the realization that simple level differences at the loudspeakers would translate into both level and phase differences at the ears, thus better approximating the way sound is heard naturally (more on this topic later). To create only level differences at the loudspeakers, Blumlein had to capture only level differences at the microphones. A coincident pair of directional microphones, with no time delay between either channel, can best provide such information. For this reason, the stereo configuration that today bears Blumlein's name is a coincident pair of pure pressure gradient figure-8 microphones, the patterns of which are highly directional."" (Clercq, A More Realistic View of Mid/Side Stereophony)Years would pass before enthusiasts at EMI would resurrect Binaural sound and when they did, Blumlein's work initiated a revolution - a revolution which is still in process: New methods and techniques are constantly being developed in order to make sound recordings sound as lively and real as possible. ‎

‎Sound production and sound reception by insects (a bibliography)‎

‎The Pennsylvania State University Press Toile d'éditeur 1960 In-8 (15.5x23.5 cm), reliure toile d'éditeur, dos titré, 108 pages, ouvrage en anglais ; titre frotté au dos, infimes mouillures sur le 1er plat, rares annotations au crayon, bon état. Livraison a domicile (La Poste) ou en Mondial Relay sur simple demande.‎

‎Heat, Light and Sound , Bell's Natural Science Series‎

‎G. Bell and Sons Ltd, London , Bell's Natural Science Series Malicorne sur Sarthe, 72, Pays de la Loire, France 1953 Book condition, Etat : Bon hardcover, editor's full brown printed clothes, no dust-jacket In-8 1 vol. - 405 pages‎

‎1 color plate in frontispiece(Spectra) and 10 black and white plates (complete), 383 black and white text-figures new edition, 1953 Contents, Chapitres : Preface, Contents, List of plates, xiv, Text, 384 pages, index, vii (405 pages) - 1. Heat : Introduction - The effects of heat - Heat and temperature, thermometers - The measurement of expansion of solids - The expansion of liquids - The expansion of gases - The measurement of heat - Latent heat - Kinetic theory - The water in the atmosphere - The transmission of heat - The nature of heat - Revision examples, answers - 2. Light : Introduction - The reflection of light at plane surfaces - Some properties of light demonstrated by means of a lantern, refraction - Reflection at spherical surfaces - Lenses, the eye-spectacles - The dispersion of light - Optical instruments - Radiant heat and light - Revision examples, answers - Sound : Historical and experimental introduction - The study of waves - The production and properties of sound waves - Velocity of sound, the binaural effect and its application to direction finding, sound ranging - The variations of strings - The variations of air columns, resonance - Interference, beats, discord and harmony - The variation of plates, sensitive jets - Musical instruments - Revision examples, appendix, answers - Index editor's binding in rather good condition, very lightly dusty with small black spot on the spine, inside is clean, name of the former owner on the top of the first page (private collection), no other markings, the bottom corner of few pages is lightly folded in the center of volume, it remains a very good reading copy, no dust-jacket‎

‎On Sound and Atmospheric Vibrations with the Mathematical Elements of Music Designed for the Use of Students of the University (Reprint of the second edition, Macmillan, 1871)‎

‎Kessinger Publishing's Rare Reprints (Macmillan) Malicorne sur Sarthe, 72, Pays de la Loire, France 2005 Book condition, Etat : Très Bon paperback, yellow and white printed wrappers grand In-8 1 vol. - 296 pages‎

‎ REPRINT Contents, Chapitres : Advertisement of the Second edition, Contents, xvi, Text, 280 pages with the addendum - General recognition of the air as the medium which conveys sound - Properties or air, on which the transformation and transmission of sound depend - Theory of undulations, as applied to sound, and investigation on the passage of a wave of air through a cylindrical pipe, or of a plane wave through the atmosphere generally - Investigation of the motion of a wave of air through the atmosphere considered as of two or three dimension - Transmission of waves of soniferous vibrations through different gases, solids and fluids - Experiments of the velocity of sound, and on the pressure accompanying atmospheric waves, and comparison of the experimental results with the results of theory - On musical sounds, and on the manner of producing them - On the elements of musical harmony and melody, and of simple musical composition - On instrumental music and the adaptation of music required by special instruments - On the human organs of speech and hearing - Errata fine copy, no markings - year estimated to 2005, no date inside‎

‎On the Production and Reproduction of Sound by Light. (Read before the American Association for the Advancement of Science, in Boston, August 27, 1880).‎

‎(New Haven), 1880. 8vo. Modern plain wrappers. In: American Journal of Science"", Third series, Vol. XX, No. 118, October 1880. Frontispiece-plate. Pp. 257-352 (entire issue offered). Bell's paper: pp. 305-324 and 11 textillustrations. A small stamp to verso of plate and the first leaf.‎

‎First printing of this important paper in which Bell describes his and Charles Sumner Tainter's, his assistent, invention of the Photophone or Radiophone, THE PROGENITOR OF MODERN FIBER OPTICS. This invention made possible the world's FIRST WIRELESS TELEPHONE MESSAGE, and the first call was sent from the Franklin Scool to the window of Bell's laboratory, some 213 meter away.""On June 3, 1880, Alexander Graham Bell transmitted the first wireless telephone message on his newly invented ""photophone."" Bell believed the photophone was his most important invention. The device allowed for the transmission of sound on a beam of light. Of the eighteen patents granted in Bell's name alone, and the twelve he shared with his collaborators, four were for the photophone. Bell's photophone worked by projecting voice through an instrument toward a mirror. Vibrations in the voice caused similar vibrations in the mirror. Bell directed sunlight into the mirror, which captured and projected the mirror's vibrations. The vibrations were transformed back into sound at the receiving end of the projection. The photophone functioned similarly to the telephone, except the photophone used light as a means of projecting the information, while the telephone relied on electricity."" (Mary Bellis).The first successful attempts were based upon the properties of selenium: ""The electric resistance of which varies with the degree of illumination to which it is exposed. Hence, given a transmitting instrument, such as a flexible mirror, by which the vibrations of a sound could throw into vibrations a beam of light, a receiver, consisting of sensitive selenium, forming part of an electric circuit with a battery and a telephone, should suffice to translate the varying intensities of light into corresponding varying intensities of electric current, and finally into vibrations of the telephone disk audible once more as sound."" (Prescott, George. Bell's Electric Speaking Telephone. 313 p.).‎