232 résultats
180143492Halle 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. <br/><br/><em>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. </em> unknown
1860WOC-1226Nouvelle édition, revue et corrigée par l'auteur, avec une carte repliée des Environs D'Annecy. Annecy, Imprimerie de Louis Thésio, 1860. In-12 (17x11,5cm) broché de couverture d'origine. 288pp. + Carte. + Annonces.
186153357(Paris, Mallet-Bachelier), 1861. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 52, No 8. Pp. (321-) 368. (Entire issues offered). Pasteur's paper: pp. 344-347. Minor marginal brownspots.
186153357Paris Mallet-Bachelier 1861. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences" Tome 52 No 8. Pp. 321- 368. Entire issues offered. Pasteur's paper: pp. 344-347. Minor marginal brownspots. <br/><br/><em>First printing of a milestone paper in microbiology being the paper in which Pasteur disclosed his discovery of organisms that lived without oxygen. Two years later he named them anaerobic or zymics contrasting to aerobic which only lived in the presence of free oxygen."In 1861 he turned his attention to the butyric fermentation and made another importent discovery viz. that this fermentation proceeds in the absence of oxygen. In the fermented material he found cylindrical rods which he showed were the cause of the fermentation. Following the nomenclature and ideas of the time he regarded them as animal in character and named them Vibrio." Bullock "The History of Bacteriology" p. 61. </em> unknown
1828PHO-2111Paris, Baudry, 1828. 4 volumes in-8 (18,5 x 10,5 cm), reliés plein cartonnage d’époque, dos lisse avec pièces de titre et tomaison, quelques frottements aux pièces, coins légèrement usés, très peu de rousseurs. Illustré d’une carte dépliante en frontispice du premier volume.
183247933Paris, Crochard, 1832. Contemp. hcalf. Spine gilt. Light wear along edges. Stamps to verso of titlepage. In: ""Annales de Chimie et de Physique"", 2e Series, vol. 51. (Entire volume offered). 448 pp. a. 1 folded engraved plate. Faraday's letter: pp. 404-434. Internally clean and fine.
183248329(Paris, Crochard, 1832). No wrappers. In: ""Annales de Chimie et de Physique"", 2e Series, vol. 51, Cahier 4. Pp. 337-444 (Entire issue offered). Faraday's letter: pp. 404-434 a. 1 engraved plate. Some brownspots.
