Discovery Self Induction (3 results)
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(London, 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 di…scovered 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.
Ueber elektro-dynamische Induction.
"HENRY, JOSEPH - THE DISCOVERY OF SELF-INDUCTION - GERMAN VERSION.
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Seller: Herman H. J. Lynge & Søn ILAB-ABF, Copenhagen, DenmarkHerman H. J. Lynge & Søn ILAB-ABF
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(Leipzig, Johann Ambrosius Barth, 1842). Without wrappers. In "Annalen der Physik und Chemie. Hrsg. von J.C. Poggendorff", Ergänzungsband 1, Stück 2. Pp. 193-384 a. 1 folded engraved plate. (The entire issue offered). Henry's paper: pp. 282-312. First German version of Henry's description of his discovery of self-induction. He m…issed the credit for the discovery of induction to Faraday, but he had done the key experiment ahead of Faraday, but Faraday was the first to publish. But he is credited for the discovery of self-induction (1832) and Faraday discovered it independently two years later (1834)."In Henry's paper, however, he explained thet the electric current in a coil can induce another current not only in another coil but in itself. The actual current observed in the coil is, then, the combination of the original current and the induced current. This is called self induction."(Isac Asimov).The issue contains further notable papers Michael Faraday's "Vierzehnte Reihe von Experimental-Untersuchungen über Elektricität", § 2o-22. (Nos 1667-1748). Pp. 249-281. First German version. In this paper FARADAYamplifies his theory of electrostatic induction by making further use of the analogy with the induction of magnetism. Whittaker describes the paper as having "THE FUNDAMENTAL EQUATION OF ELECTROSTATICS", as modified in order to take into account the effect of the specific inductive capacity."(Whittaker I, pp.187-89).
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Philadelphia, Fraklin Institute, 1835. 8vo. Later full green cloth. Tome-and titlelabels in leather with gilt lettering on spine. In: "Journal of the Franklin Institute of the State of Pennsylvania. Edited by Thomas P. Jones", Vol. XV. New series. Engraved frontisp. (2),446 pp., 2 folded engraved plates and 2 folded engraved map…s. (Entire volume offered). Henry's announcement: pp. 169-70. A stamp to verso of frontispiece (Library of Congress duplicate stamp). First printing of this importent paper, the first to describe in detail how the phenomena of Self-Induction was discovered. Henry discovered the induction phenomena - how an electric current in one coil may set up a current in the other through the development of the magnetic field - independently of Faraday, but Faraday was first to publish on electromagnetic induction. Henry's experiments with induction led him to his importent discovery of SELF-INDUCTION, which is the phenomenon in which a change in electric current in a coil produces an induced emf in the coil itself. This phenomenon was also discovered inependently by Faraday, but this time Henry had published first. The basic unit of inductance was to be called "the Henry". Relevant to the controversy between Faraday and Henry is the following statement by A D Bache, Secretary of the American Philosophical Society introducing an abstract of Henry in J Franklyn Inst. 1835 pp. 169-70 (H. Norman 1053 and the paper offerd): "A memoir on this subject has been since submitted to the Society, containing an extension of the subject, the primary fact in relation to which was observed by Professor Henry as early as 1832, and announced by him in the American Journal of Science. Mr. Faraday having recently entered upon a similar train of observations, the immediate publication of the accompanying is important, that the prior claims of our fellow countryman may not be overlooked."(Spark Museum).Magee "Source Book in Physics", p. 515.