Abstract
My dear Sir,—The newspapers having reported that a society of English shareholders intends to lay a second cable for transatlantic telegraphy, you will allow me to give here a brief account of some experiments by which I have succeeded in proving the effect of pressure on electric conductibility in metallic wires. The method which I have resorted to is the one devised by MM. Christie and Wheatstone, which is called the electrical bridge. The current of a Bunsen’s battery of six large cells was divided between the wire to be tested (a very soft copper wire 0⋅05 of an inch in diameter, and covered with gutta percha) and another conductor; both being connected with a delicate Ruhmkorff’s galvanometer, so that the needle remained on the zero point. All contacts were made invariable by solderings.
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