Discovery

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HENRY, JOSEPH - THE DISCOVERY OF SELF-INDUCTIONBiblio.com

On the Influence of a Spiral Conductor in increasing the Intensity of Electricity from a Galvanic Arrangement of a Single Pair &c.

1837ref. 47418London Richard and John E. Taylor 1837. No wrappers. Extracted fron "Scientific Memoirs selected from The Transactions of Foreign Academies of Science and Learned Societies. Edited by Richard Taylor." Vol. I. Pp. 540-547. Henry's milestone paper announcing his discovery of electrical self-induction. "Henry independently discovered electro-magnetic induction and in this paper announced his discovery of electric self-induction one of the prime properies of an electro-magnetic circuit. Henry was an eminent experimenter but was casual in publishing his findings with resulting lack of recognition of his contributions."Bern Dibner.Dibner "Heralds of Sciece" No.63.It was also printed the same year in "Transactions of the American Philosophical Society New Series Vol. 5". The paper was later printed in "Philosophical Magazine" 1840."The direction of Henry’s thought became somewhat apparent in his 1835 paper refers to the papers reading before the American Phil. Soc. febr. 6th 1835 on the action of a spiral conductor in increasing the intensity of galvanic currents. The paper started out as an affirmation of Henry’s priority in the discovery of self-induction. He then combined induction proper using Faraday’s findings and his own with selfinduction to show how these produce a pattern of repulsions yielding an increased effect in spirals. He specifically linked these “magneto-electrical” results to the principles of static induction developed by Cavendish and Poisson. This explanation was then applied to Savary’s report of changes of polarity when magnetic needles were placed at varying distances from a wire in which a current was being transmitted "Mémoire sur l’aimantation" in Annales de chimie et de physique 34 1827. That is currents appeared periodically in the air surrounding a current-bearing straight wire as a result of the actions of induction and self-induction." DSB.Wheeler Gift: 2724-2725a. unknown

Herman H. J. Lynge & Søn A/S · DenmarkDKK 3,500.00≈ €468.25

PELLETIER, PIERRE et JOSEPH CAVENTOU - THE DISCOVERY OF STRYCHNINEBiblio.com

Note sur un nouvel Alcali Lu à l'Academie des Sciences le 10 août 1818. Mémoire Sur un nouvel Alcali végétal la Strychine trouvé dans la fève de Saint-Ignace la noix vomique etc. Lu à l'Academie des Sciences le 14 décembre 1818.

1818ref. 43871Paris Crochard 18181819. No wrappers. In: "Annales de Chimie et de Physique Par MM. Gay-Lussac et Arago." tome 8 Cahier 3 a. 10 Cahier 2 pp. 225-336 and pp. 129-240. Entire issues offered. Pelletier & Caventou's papers: pp. 323-324 tome 8 and pp. 142-176 tome 10. A few scattered brownspots. First printing of these classic papers in chemistry in which the authors announced their discovery of Strychnine. This was the first alkali of vegetable origin to be discovered after morphine. This discovery and their discovery of chlorophyll brought them international fame. The first small paper contains the announcement of the discovery and the second long memoir contains the elaborate exposition of the discovery."Strychnine was only the second alkaloid to be extracted the first was morphine. Pelletier and Caventou wanted to name their new alkaloid vauqueline after Nicolas Vauquelin one of their associates who had refined the technique of ether extraction for use in isolating alkaloids. However the officers of the Académe des Sciences in Paris rejected the idea on the grounds that a respected scientist’s name should not be paired with a deadly poison. In addition to strychnine the pair isolated other important compounds from plants including caffeine chlorophyll and the anti-malaria drug quinine. Paul L. Burnham.Parkinson:"Breakthroughs" 1818 C. - Garrison & Morton: 1846.The first issue also contains their importent memoir "Examen chimique de la Cochenillee et de sa matière colorante" pp. 250-287 which describes how they obtained crotonic acid from croton oil and analyzed carmine in the cochineal. unknown

Herman H. J. Lynge & Søn A/S · DenmarkDKK 3,500.00≈ €468.25

RITTER, (JOHANN W). - THE DISCOVERY OF "CHEMICAL RAYS" - ULTRAVIOLET LIGHT AND RADIATIONBiblio.com

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.

1801ref. 43492Halle 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. unknown

Herman H. J. Lynge & Søn A/S · DenmarkDKK 3,500.00≈ €468.25

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