The Philosophical Magazine Vol 5

Author : David Brewster
Publisher :
ISBN 13 : 9781330640852
Total Pages : 492 pages
Book Rating : 4.6/5 (48 download)

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Download or read book London and Edinburgh Philosophical Magazine and Journal of Science, Vol. 5 written by David Brewster and published by . This book was released on 2015-07-03 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from London and Edinburgh Philosophical Magazine and Journal of Science, Vol. 5: New and United Series of the Philosophical Magazine and Journal of Science, July December, 1834 Having observed, whilst I was using my dipping-needle with its magnetic deflector (noticed in No. 20, Third Series of the London and Edinburgh Philosophical Magazine: vol. iv. p. 81), that the ratio of the magnetic forces was not uniform, I was induced to enter upon a series of experiments for the purpose of investigating these forces. Of the various methods I adopted, I think it may be sufficient for me to describe that only which seemed on the whole to be most satisfactory and decisive. To the extremity of a horizontal beam, delicately balanced on knife-edges, a magnetic bar was attached, with its axis in a vertical direction, and a counterpoise was suspended from the other end of the beam. Immediately under the attached or suspended magnet, and in the same vertical line, another similar magnet was placed, in a glass tube, in which it could be moved freely up or down, a graduated scale having been fixed to the tube to mark the exact distance between the contiguous poles of the two magnets; and when the poles were brought very near each other, mica, paper, card-board, &c., were placed between them, 2, 4, or 8 pieces being pasted together to obtain the duplicate ratios of the distances. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.