Elementary Lessons In Electricity Magnetism

Excerpt from Elementary Lessons in Electricity Magnetism These Elementary Lessons have now been largely rewritten. The considerable changes made have been necessitated not only by the progress of the science but by the piracy, covert as well as open, to which since its appearance in 1881 the book has been subjected. In the thirteen years which have elapsed much addition has been made to our knowledge, and many points then in controversy have been settled. The system of electric units, elaborated first by the British Association and subsequently in several International Congresses, is now legalized in the chief civilized countries. New magnetic surveys - in England by Thorpe and Rücker, in the United States under Mendenhall - have enabled new magnetic charts to be prepared for the epoch 1900 A.D. The researches of Ewing, Hopkinson, and others on the magnetic properties of iron, and the general recognition of the principle of the magnetic circuit, have advanced the science of magnetism, to which also Ewing's molecular theory has given an added interest. The properties of alternate currents, of which in 1881 little was known, have been forced into study by the extension of their industrial uses in telephony and in electric lighting. 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.

Excerpt from Elementary Lessons in Electricity and Magnetism These Lessons in Electricity and Magnetism are in tended to afford to beginners a clear and accurate knowledge of the experiments upon which the Sciences of Electricity and Magnetism are based, and of the exact laws which have been thereby discovered. The difficulties which beginners find in studying many modern text-books arise partly from the very wide range of the subject, and partly from want of famili arity with the simple fundamental experiments. We have, at the outset, three distinct sets of phenomena to observe, viz. - those of Frictional Electricity, of Current Electricity, and of Magnetism; and yet it is impossible to study any one of these rightly without knowing something of them all. Accordingly, the first three Chapters of this work are devoted to a simple exposition of the prominent experimental facts of these three branches of the subject, reserving until the later Chapters the points of connection between them, and such parts of electrical theory as are admissible in a strictly elementary work. N o knowledge of algebra beyond simple equations, or of geometry beyond the first book of Euclid, is assumed. 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.