Other editions of book Course of Lectures on Electricity: Delivered Before the Society of Arts

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. 1891 Excerpt: ... proves rotation of the ether or of the molecules in the interior of magnetised bodies. We have now seen many connections between magnetic phenomena and purely mechanical motions; but, even at the risk of tiring you with the subject, I must draw your attention to another class of phenomena attendant upon the magnetisation of iron which was first discovered by Joule. He proved that when an iron bar is magnetised Fig. 10.--Bidwell'g apparatus. C is a coil of wire, It an iron rod working the lever, L, which has a fulcrum F The lengthening or shortening of the rod E is shoTM by the movements of a spot of light reflected from the mirror, M, on a pivot, P. its length is increased. It has been supposed by some that the cause is to be found in a greater length of the molecule of iron along its magnetic axis, so that when all the molecules are twisted so that their lengths all point one way the bar is lengthened. This view is rather weakened by the subsequent discovery of Mr. Shelford Bidwell, who has confirmed Joule's discovery so far as moderate magnetisation is concerned. But he finds that when the magnetisation is increased the bar ceases to expand, diminishes to its natural length, and with very powerful magnetising forces actually contracts to a considerable extent. As to the causes of these phenomena we are in darkness. But I feel confident that they are bound to tell us a great deal about the true physical meaning of magnetism. I consider myself fortunate in being able to show you with Mr. Bidwell's assistance the results which he has obtained. The apparatus used by him consists of a piece of iron rod fixed at the lower end, but pressing upwards on a lever. The long arm of that lever acts upon a mirror resting on a pivot, so that if the iron rod lengthens it...

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Excerpt from A Course of Lectures on Electricity, Delivered Before the Society of ArtsSheet of glass. B. Silk rubber. C. Light metal ball on stiff fibre of shellac, suspended by a thread. If C has previously touched A it moves from A towards B. If it has touched B it moves from B towards A.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.