Publisher's Synopsis
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.
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