Journal of the Franklin Institute of the State of Pennsylvania, 1833, Vol. 12

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Excerpt from Journal of the Franklin Institute of the State of Pennsylvania, 1833, Vol. 12: Devoted to the Mechanic Arts, Manufactures, General Science, and the Recording of American and Other Patented InventionsThe great difficulty in resorting to this means of discrimination, is, that an electrified body may, by induction, produce in a conductor al ternately, Opposite states of electrical excitement. As it approximates the conductor, it may cause it to receive, or give out electricity, of course, when retracted, the conductor will have the opposite excite ment to that consequent to approximation. Supposing the brass ball of the electrometer in question, to be affected in the mode just de scribed, the leaf suspended from it, must be successively attracted by each pole. Besides, the excitement may be so strong, as to render that ofthe series nugatory, as in the case of a powerful magnet, which will attract either pole of a feeble one.The direction of the first pulsation of the leaf, is the best criterion, but reliance should not be accorded to one experiment, especially when so easily repeated. I find that a gilt pith ball, if suspended in place of the leaf, will vibrate for a time. It is, however, like the leaf, liable to have its movements arrested by an adherence, to one or other of the knobs.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.