Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 89
Gravity Daiiiell Cell, Fig. 85. Btudetl s Porous ( up Daniel] Cell. constant current for an indefinite time, therefore, it is onlynecessary 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…
Electricity · Magnetism
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