[Illustration: FIG. 193.—An Electric Breeze.]
A STATIC MOTOR.
This is a motor operated by the electricity from a static machine. It does not possess any appreciable amount of power and must be very carefully built and balanced in order to operate.
It consists of four celluloid "ping-pong" balls, B, B, B, B, covered with tinfoil and mounted on opposite ends of two wooden spokes. The balls should be at right angles to each other as shown in the illustration. The spokes pass through a cork. The cork is mounted on a wire spoke or knitting needle passing through its centre and supported in small notches in the top of two upright wooden bearings. The device must be very carefully balanced so that the slightest impulse will cause it to spin and so that there will not be any dead centre.
The upright bearings are mounted on a wooden base. Two other tinfoil covered balls A, A, are supported on glass or rubber insulating rods at opposite ends of the base on a level with the axle and in such a position that the balls B, B, B, B, almost touch A and A as they swing past.
[Illustration: FIG. 194.—The Static Motor.]
Connect A and A each to one discharger rod on the Wimshurst machine. Start the machine and give the axle of the static motor a twist. As the balls B, B go past A and A they will receive a charge of electricity which will cause them to repel each other until they have swung past the other ball on the opposite side and discharge their electricity in return for a charge of the opposite sign.
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