St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 43
40 VARIOUS VOI.TAIC CELLS. … Fig. 44. 56. The Gravity Cell, sometimes called the bluestoneor crowfoot c^W, is used largely for telegraph, police, andfire-alarm signal service, laboratorjand experimental work, or whenevera closed circuit cell is required. TheE.M.F. is about one volt. This is amodified form of the Daniell cell.…
Electricity
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