Excerpt from Johns Hopkins University Circulars, Vol. 20: May-June, 1901 The mounted disk of ebonite Has whirled before nor whirled in vain, Rowland of Troy, that doughty knight, Convection currents did obtain, In such a disk, of power to wheedle From its loved north the subtle needle. Rowland showed by the direct effects produced on a magnetic needle that a charged body in motion gave rise to a magnetic field just as though it were a current whose strength depended on the product Of the charge and the velocity. This result is of fundamental importance to electrical theory; it was confirmed by Rowland and Hutchinson in 1889, and has been generally accepted as an established fact. Within the last few months, however, Cremieu has published an account of a repe tition of Rowland's experiment which has led him to a negative result; the question just at the present moment appears to need further investigation. 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.