The Discovery of Induced Electric Currents

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CONTENTS Faraday's Independent Discovery of Self-induction ... 13 Henry's Later Experiments 14 Effects of Size of Wire 15 Coiling of Wire 15 Battery-Strength 16 Introduction of Iron 17 Physiological Action 18 Connection between Self- and Mutual Induction 19CONTEIBUTIONS TO ELECTRICITY AND MAGNETISM No. II...
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CONTENTS Faraday's Independent Discovery of Self-induction ... 13 Henry's Later Experiments 14 Effects of Size of Wire 15 Coiling of Wire 15 Battery-Strength 16 Introduction of Iron 17 Physiological Action 18 Connection between Self- and Mutual Induction 19CONTEIBUTIONS TO ELECTRICITY AND MAGNETISM No. II On The Influence Of A Spiral Conductor In Increasing The Intensity Of Electricity From A Galvanic Arrangement Of A Single Pair, Etc. By JOSEPH HENRY (Transactions American Philosophical Society, n. s., Vol. V. pp. 223- 331, read February 6, 1835; Scientific Writings, Vol. I, p. 92.) In the American Journal of Science for July 1832, I announced a fact in Galvanism which I believe had never before been published. The same fact, however, appears to have been since observed by Mr. Faraday, and has lately been noticed by him in the November number of the London and Edinburgh Journal of Science for 1834. The phenomenon as described by. me is as follows: When a small battery is moderately excited by diluted acid, and its poles, terminated by cups of mercury, are connected by a copper wire not more than a foot in length, no spark is perceived when the connection is either formed or broken; but if a wire thirty or forty feet long be used instead of the short wire, though no spark will be perceptible when the connection is made, yet when it is broken by drawing one end of the wire from its cup of mercury, a vivid spark is produced. If the action of the battery be very intense, a spark will be given by a short wire; in this case it is only necessary to wait a few minutes until the action partially subsides, and until no more sparks are given from the wire; if the long wire be now substituted a spark will 'be again obtained. The effect ap...