Meadowcroft, Wm. H. (William Henry), b. 1853 · New York & London, Harper & brothers · leaf 62
ill be given. If youput your fingers on top of asilk hat and speak near it youwill feel vibrations of yourvoice. Every time you speak youcause vibrations of the air;and the louder and higher youspeak the greater the numberof vibrations. Suppose you take a thinpiece of wood in your hands(say, for… … Fig. 10 A-B-C OF ELECTRICITY the vibrations of the air cause the wood tovibrate in the same manner. These vibra-tions are very minute and cannot be seenwith the naked eye, but they actually takeplace, and could be measured with a deli-cately balanced instrument. Now let us try another experiment…
Electricity
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