Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 83
scol-ored or rough, the negative plate should be takenout, and brushed with a little whiting and soap andwater. The thickness of the coating of gold andsilver is proportional to the time occupied by the de-position and the amount of electricity which passes.For the same amount of electricity, 32… … be placed in a solution of cyanide of silver or gold ina capsule, the metals will be thrown down upon itFig. 37. in a very satisfactory manner, if a small slip of zinc be placed in con-tact with it, as represented by Z inFig. 37, and the whole be heatedby a spirit-lamp. It is necessarythat there…
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