Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 414
; but Fig. 3go, … Pith Ball Electroscope. it is hoped that some of the hints given in regard to theconstruction of the electrical machine, and some of theapparatus to be used in connection with it, will enable thestudent of electricity to at least begin a course i)f experi-ments which will prove of interest. 392…
Physics · Lantern projection · Electric apparatus and appliances
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