Address Before the St. Louis Academy of Science at Its Annual Meeting for 1877 by the President Charles V. Riley (Classic Reprint)

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Excerpt from Address Before the St. Louis Academy of Science at Its Annual Meeting for 1877 by the President Charles V. RileyA. H. Rowland, of John Hopkins University, has made important stu dies in the distribution of magnetism in bar magnets. He reaches the conclusion that' hardening is more useful in short-bar magnets than in needles, and that boring a hole in the centre of the magnet is, in general, hurtful. J. Trowbridge, of Harvard, demonstrates experimentally that by distributing the fine wire of an induction coil upon two straight electro magnets (instead of one), whose poles are provided with armatures con sisting of bundles of thin, soft iron plates, the strength of the spark is increased 400 per cent. When large condensers are used.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.