Dancing Balls

Take a common tumbler or glass jar, and having placed a brass ball in

one of the holes of the prime conductor, set the machine in motion,

and let the balls touch the inside of the tumbler; while the ball

touches only one point, no more of the surface of the glass will be

electrified, but by moving the tumblers about, so as to make the ball

touch many points successively, all the points will be electrified, as

will appear by turning down the tumbler over a number of pith or cork

balls placed on a table. These balls will immediately begin to fly


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