St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 14
c viachme consisted of a ball of sulphurfastened to a spindle which could be turned by a crank.By holding the hands or a pad of silk upon the revolvingball, eledtricity was produced. 9. The Cylinder Electric Machine consists, asshown in Fig. 6, of a glass cylinder so mounted that itcan be turned by… … 12 ABOUT FRICTIONAL EtECTKICITY.
Electricity
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