St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 41
Fig. 39- 38 VARIOUS VOtTAIC CELLS. 52. The Grenet Cell. Fig. 40 is another form ofbichromate cell. The carbon plates are left in the fluidconstantly. The zinc plate should be raised when thecell is not in use, to keep it from being uselessly dissolved.
Electricity
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