Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 42
with an electrophorus. 340. Whence this Energy?—At every dischargeof the electrophorus, it gives a definite amount of elec-tricity, capable of doing a definite amount of work. Asthis is obtained not by the expenditure of any part of theoriginal charge, we are led to seek for the source of… … Fig. 138. force of electric attraction to be overcome as well as theforce of gravity. Slightly harder work is done at the ex-pense of the muscular energies of the operator and this is 213 FRICTTONAL ELECTRICITY, the real origin of the energy stored up in the separatecharges/^ Experiment…
Electricity · Magnetism
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