Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 89
Gravity Daniell Cell. Fig. %b Students Porous CupDaniell Cell. constant current for an indefinite time, therefore, it is onlynecessar}^ to keep the supply of copper crystals and zincmaintained. The cell has an E. M. F. of about one volt andgives a small, but steady current. The gravity type ofthis…
Electricity · Magnetism
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