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HERAPATH, JOHN - THE KINETIC THEORY OF GASESBiblio.com

On the Physical Properties of Gases. To Dr. Thomsen A Mathematical Inquiry into the Causes Laws and principal Phaenomena of heat Gases Gravitation &c. 3 Parts.

1816réf. 46878London Baldwin Cradock and Joy 1816 a. 1821. Bound in 2 uniform contemp. moiré boards. Light wear along edges and a fes smaller scratches. In: "Annals of Philosophy; or Magazine of Chemistry Mineralogy Mechanics Natural History. By Thomas Thomson." Vol. VIII and New series Vol. I. VIII479 pp. a. 9 engraved plates VIII479 pp. a. 7 engraved plates. Entire volumes offered. Herapath's papers: pp. 56-60 1816 a. pp. 273-293 340-351 a. 401-416. First printing of these contoversial papers where Herapath revived the kinetic theory of gases. His theory was more or less neglected by the scientific community at his time. The kinetic theory remained dormant and forgotten after Euler's and Bernouilli's work "until 1816 when Herapath proposed a theory which is essential Bernoulli's. Unfortunately he chose to define temperature as being proportional to the momentum rather than the kinetic energy of molecules. Herapath was the first to show more or less that kinetic theory can provide simple explanations for the changes of state diffusion and the propagation of sound."Trousdell "Essayas in the History of Mechanics" pp. 283 ff.Euler Bernoulli Herapath and Waterston may be considered the principal scientists who prior to 1850 attempted a more or less complete mathematical treatment of gases based on a set of molecular postulates. Jamie Wisniak."Having published a preliminary notice of his theory in the Annals of Philosophy in 1816 Herapath submitted a detailed account to the Royal Society in 1820. Davy who was elected to the presidency of the Society in November of that year was primarily responsible for the fate of the paper. Although Davy was already known as an advocate of the qualitative idea that heat is molecular motion he found Herapath’s quantitative development too speculative and complicated; he rejected the hypothesis of an absolute temperature implying an "absolute zero" of cold. Having been told that his paper would not be accepted for publication in the Philosophical Transactions Herapath withdrew it and published it instead in the Annals of Philosophy in 1821. Five years later he launched an attack on Davy in the Times of London accusing him of circulating unfounded criticisms of his experimental work which prevented its publication. Although Davy ignored a series of letters and challenges published in the Times Herapath later claimed Davy’s resignation from the presidency of the Royal Society 1827 as a victory for himself."DSB. hardcover

Herman H. J. Lynge & Søn A/S · Danemark5 500,00 DKK≈ 735,81 €

HELMHOLTZ, HERMANN von - FOUNDING THE MODERN THEORY OF COLOURBiblio.com

Ueber Hrn. Brewster's neue Analyse des Sonnenlichts.

1852réf. 43564Leipzig Johann Ambrosius Barth 1852. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg.von Poggendorff" Dritte Reihe Bd. 26 Achtes Stück.= Heft No. 8 of 1852. The entire issue No. 8 offered. Titlepage to vol. 26. Pp. 501-600. Helmholtz's paper: pp. 501-523. Clean and fine. First appearance of this founding paper in the modern theory of colour in which Helmholtz proved the surprising fact that there are only two among the colours of the spectrum yellow and indigo-blue which together yields pure white that is are complementary to each other whereas their combination had always been supposed to produce green."Helmholtz turned to the intricate problems of color vision in 1852 with an attack on Sir David Brewster's new theory of light. Brewster had maintained the objective reality of three primary colors by supposing in opposition to Newton that there exist three distinct kinds of light each of which excites in the eye one of the sensations red yellow or blue. Helmholtz regarded the theory as still another confusion of physical stimulus and subjective responce.He also revived Young's theory of color visoin.only to refute it. He had discovered that spectral colors when mixed always yield a duller color of less-than-spectral saturation. Therefore the whole idea that all colors may be obtained from mixtures of three primary colors must be incorrect he concluded for the spectral colorss at least can never be obtained in their full saturation by mixing any three of their number.Although Helmholtz dismissed Young's theory in 1852 by 1858 he had changed his mind and become its formost advocate. In order to save Ypoung's theory.Helmholtz asumed that Young's physiological primaries are not spectral colors att all but colors of far greater-than-spectral saturation."DSB VI pp. 246-247. Garrison & Morton 1508. unknown

Herman H. J. Lynge & Søn A/S · Danemark3 500,00 DKK≈ 468,24 €

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