Report of the Board of Regents Volume 33 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ...extension of Schweigger's multiple coil was unimportant and unmeritorious, the ready answer occurs, that talented and skillful electricians, laboring to attain the result, had for six years failed to make such an extension. Nor was the result by any means made antecedently assured by Schweigger's success with the galvanometer. If Sturgeon's improvement of economizing the battery size and consumption, by increasing the magnet factor (in those few cases where available), was well deserving of reward surely Henry's improvement of a far greater economy, by increasing the circuit factor (entirely neglected by Sturgeon), deserved a still higher applause. In a subsequent communication td Silliman's Journal, Henry remarks on the results announced in October, 1827: "Shortly after the publication mentioned, several other applications of the coil, besides those described in that paper, were made in order to increase the size of electromagnetic apparatus, and to diminish the necessary galvanic power. The most interesting of these was its application to a development of magnetism in soft iron, much more extensive than to my knowledge had been "Transactions of Ike Albany Institute, vol. i, pp. 22,23. previously effected by a small galvanic element." And in another later paper, lie repeated to the same effect: "After reading an account of the galvanometer of Schweigger, the idea occurred to me that a much nearer approximation to the theory of Ampere could be attained by insulating the conducting-wire itself, instead of the rod to be magnetized; and by covering the whole surface of the iron with a series of cods in close contact." The electromagnet figured and described by Sturgeon (in his communication of November, 1825, ) consisted of a small bar ...