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LECOQ de BOISBAUDRAN, PAUL EMILE - ANNOUNCING THE DISCOVERY OF THE ELEMENT GALLIUMBiblio.com

Caractéres chimique et spectroscopiques d'un nouveau métal le Gallium découvert dans une blende de la mine de Pierrefitte vallée d'Argelès Pyrénées. Séance du Lundi 20 Septembre 1875. Sur quelques propriétés dy gallium. Séance du Lundi 6.

1875Best.-Nr. 47271Paris Gauthier-Villars 1875. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences" Tome 81 No 12 and No 23. Pp. 485- 508 a. 1065- 1148. 2 entire issues offered. Boisbaudran's papers: pp. 493-495 a. pp. 1100-1105. First printing of the paper in which Boisbaudran announced his discovery of Gallium together with the first printing of the paper in which he by a series of experiments proved that Gallium the metal that he had discovered amd named in honour of France is a true element. A larger paper on the discovery was published in 1877 in "Annales de Chimie et Physique". In 1879 Bausbaudran was awarded the Davy Medal for his discovery of Gallium. "In 1875 Boisbaudran spectroscopically discovered a new element gallium which he found in zinc blende from a mine in Hautes-Pyrénées. Continuing his work in Wurtz’s laboratory in Paris he was a able to obtain the free metal by electrolysis of a solution of the hydroxide in potassium hydroxide. Gallium Boisbaudran realized was the "eka-aluminum" predicted by Mendeleev and was the first of Mendeleev’s predicted elements to be isolated. Boisbaudran’s finding thus provided valuable evidence for the validity of Mendeleev’s periodic classification of the elements."DSB."Lecoq de Boisbaudran announced his discovery by spectroscopic analysis of the new element gallium. Mendeleev had first predicted its existence and had named it eka-aluminium. The discovery was made in the author's private laboratory in a specimen of zinc blende from the Pierrefitte mine in the Angelès Valley in the Hautes Pyrénées. He describes how on the evening of 27 August 1875 he detected the existence of this new element which he named "gallium" in honor of France Gallia. A month later he "performed in Wurtz's laboratory in Paris.a series of experiments to prove that gallium.is a true element"Weeks. he discusses how he eventually isloated small amounts of pure metallic gallium and determined its physical and chemical properties. The paper the paper offered first describes gallium compounds e.g. ammonium gallium alum chloride oxide and sulphate."Roy G. Neville II p. 29. unknown

Herman H. J. Lynge & Søn A/S · Dänemark4.500,00 DKK≈ 602,02 €

PASTEUR, LOUIS - ANNOUNCING THE DISCOVERY OF "MOLECULAR ASSYMETRY"Biblio.com

Mémoire sur la relation qui peut exister entre la forme cristalline et la composition chimique et sur la cause de la polarisation rotatoire; Extrait. Séance du Lundi 22 Mai 1848.

1848Best.-Nr. 49456Paris Bachelier 1848. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences" Tome 26 No 21. Pp. 529- 548. Entire issue offered. Pasteur's paper: pp. 535-538. Clean and fine. First appearance of the announcement of Pasteur's momentous and revolutionary discovery of "molecular assymetry" and founding the science of Polarimetry.The discovery was first announced by Pasteur in may 1848 by the printing of the preliminary report of only 4 short pages in order to establish priority the paper offered. A more full exposition was published the same year in "Annales de Chimie et de Physique" 3me Series - Tome XXIV."In 1848.Pasteur studied the crystals of tartrates one of the substances that exhibited the now-clockwise now-counterclockwise effect under the microscope and found that the xcrystasls were mirror images of the others. The two crystals resemmbled each other as a right-hand glove resembles a left-hand glove.This was a revolutionary discovery and it took some courage to announce it. A few years before the well-known chemist Mitscherlich had studies the same tartrate crystals and declared them all to be identical. Pasteur was only a twenty-sic-year-old unknown. neverthelless he announced his findings and went before Biot to repeat the separation ofthe crystals before the eyes of the aged authority in the field. Biot was convinced and Pasteur received the Rumford medal of the Royal Society for his work.Pasteur had thus founded the science of polarimetry in which the measurements of the manner in which the plane of polarized light was twisted could be used to help to determine the structure of organic substance to follow various chemical reactions and so on."Asimov. Leicester & Klickstein "A Source Book of Chemistry" p. 374-379. unknown

Herman H. J. Lynge & Søn A/S · Dänemark4.500,00 DKK≈ 602,02 €

PASTEUR, LOUIS - ANNOUNCING THE DISCOVERY OF "MOLECULAR ASSYMETRY"Biblio.com

Mémoire sur la relation qui peut exister entre la forme cristalline et la composition chimique et sur la cause de la polarisation rotatoire; Extrait. Séance du Lundi 22 Mai 1848.

1848Best.-Nr. 47149Paris Bachelier 1848. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences" Tome 26 No 21. Pp. 529- 548. Entire issue offered. Pasteur's paper: pp. 535-538. First appearance of the announcement of Pasteur's momentous and revolutionary discovery of "molecular assymetry" and founding the science of Polarimetry.The discovery was first announced by Pasteur in may 1848 by the printing of the preliminary report of only 4 short pages in order to establish priority the paper offered. A more full exposition was published the same year in "Annales de Chimie et de Physique" 3me Series - Tome XXIV."In 1848.Pasteur studied the crystals of tartrates one of the substances that exhibited the now-clockwise now-counterclockwise effect under the microscope and found that the xcrystasls were mirror images of the others. The two crystals resemmbled each other as a right-hand glove resembles a left-hand glove.This was a revolutionary discovery and it took some courage to announce it. A few years before the well-known chemist Mitscherlich had studies the same tartrate crystals and declared them all to be identical. Pasteur was only a twenty-sic-year-old unknown. neverthelless he announced his findings and went before Biot to repeat the separation ofthe crystals before the eyes of the aged authority in the field. Biot was convinced and Pasteur received the Rumford medal of the Royal Society for his work.Pasteur had thus founded the science of polarimetry in which the measurements of the manner in which the plane of polarized light was twisted could be used to help to determine the structure of organic substance to follow various chemical reactions and so on."Asimov. Leicester & Klickstein "A Source Book of Chemistry" p. 374-379. unknown

Herman H. J. Lynge & Søn A/S · Dänemark4.500,00 DKK≈ 602,02 €

RAOULT, F-M (FRANCOIS MARIE). - DISCOVERY OF RAOULT'S LAWSBiblio.com

Loi générale de congélation des dissolvants Mémoire de. Extrait par l'auteur. Loi générale des tensions de vapeur des dissolvants. 2 Papers.

1882Best.-Nr. 47024Paris Gauthier-Villars 1882. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences" Tome 95 No 22 a. Tome 104 No 21 entire issues offered. Pp. 1017-1076 and pp. 1387-1462. Raoult's papers: pp. 1030-33 tome 95 and pp. 1430-1433 tome 104. First appearance of Raoult's two importent papers in which described a method for finding the molecular weight of an organic compound by the determination of the lowering of the freezing point of water that resulted from dissolving that compound in water and the law governing the relation between solutes and vapor pressure."Then in 1882 F.-M. Raoult published his results on the effects of nondissociating organic solutes from which he deduced a general law controlling the lowering of freezing points the first paper offered. Four years later he extended this work to show the effect of solutes on vapor pressure the second paper offered. Having established the effect of nondissociating compounds he was in position to show that salts produced an eeffect which though anomalous could nevertheless be explained by the supposition that a dissolved molecule broke up into other molecules. This work was of great value in supplying a new method for determining molecular weights since the depression of freezing point and vapor pressure as well a the related rise in boiling point later discovered are proportional to the moleculat concentrations ofthe solutions; it was of equal value in supporting the ideas of van't Hoff on osmotic pressure. With the announcement of the dissociation theory of Arrhenius the anomalies were explained and the full significance of the generalizations of Raoult was recognized. Raoult published the formulations of his laws in the "Comptes Rendus" for 1882 and 1887 the papers offered" Leicester a. Klickstein "A Source Book in Chemistry" pp. 471 ff. unknown

Herman H. J. Lynge & Søn A/S · Dänemark3.800,00 DKK≈ 508,38 €

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