Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 543
itions we have described,no action will be perceived, no gas will be given off, nor will the zinc dis-solve in the acid. If the electrical condition of the portion of the copper-plate which is out of the liquid be examined by means of a delicate electro- ELECTRICITY. 491 scope, it will be found to… … Fig. 256.—A Voltaic Elemein. each other, or if a wire be attached to each plate, as shown in the figure^and the wires be brought into contact outside of the vessel, an action inthe liquid is immediately perceptible at the surface of the copper plate,when a multitude of small bubbles of hydrogen gas…
Inventions
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