Trebel, George. [from old catalog] · New York, F. Tousey · leaf 21
ty. Then place the tin disk on the 14 HOW TO MAKE AND vulcanite; the negative electricity of the vulcanite will polarizethe disk, inducing positive (f) electricity on its lower surfaceand — electricity on its upper surface. Now place a finger onthe disk. The — electricity will escape through your… … 2SF$ *V™ Iulca?lte the f electricity of the disk is now free,£« &.££ »™.? °-n°ne of y°ur naEds (Fig. 2) is brought nearit, a bright spark will pass from it to your hand, and it will be-come discharged. The disk may be charged and discharged in the same man-Se^lt °f timeS WUh0Ut ■**» whipping…
Electricity
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