. How to make and use electricity ... f light is thrown upon USE ELECTRICITY. 53 the graduated index, A B, a movement of this image lo one sideor other being made to represent the dots ?.ad dashes of theMorse alphabet. To give steadiness to the needle it is broughtto rest by a magnet after each deflection. By an enlargement o| ..the graduated scale some very dUicateillustrations of electric action can be given. Thus, to showthat dissimilar metals plunged in the same liquid will evolveelectr;cit>,tlie wires leading to the galvanometer may be joinedup to a steel knife and a silver fork, and o
. How to make and use electricity ... f light is thrown upon USE ELECTRICITY. 53 the graduated index, A B, a movement of this image lo one sideor other being made to represent the dots ?.ad dashes of theMorse alphabet. To give steadiness to the needle it is broughtto rest by a magnet after each deflection. By an enlargement o| ..the graduated scale some very dUicateillustrations of electric action can be given. Thus, to showthat dissimilar metals plunged in the same liquid will evolveelectr;cit>,tlie wires leading to the galvanometer may be joinedup to a steel knife and a silver fork, and on fixing the fork intoa piece of raw meat the light on the scale will be sensibly de-pleted at the instant the knife is brought also in contact withthe meat. A cell consisting of a copper percussion cap with asmall morsel of zinc has been found to create sufficient elec-tricity to send a message across the Atlantic. In his ink-recorder, Sir William Thomson has given anotherbeautiful adaptation of electric science. A fine coil is sus-.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectricity, bookyear
