wn on itsinner cylinder, producing a very slow run, but a certainmomentum will be developed which, as soon as thewheel strikes rail No. 2, will change the rate of velocityto a much higher degree, because on the second railthe wheel runs on its outer cylinders. Thus you havea wheel running faster up… … AN OPTICAL ILLUSION. at the same level with the electrodes. To the whirlyou fasten a circular piece of stiff white paper withsome regular figure on it in black. The pivot onwhich the whirl is to rotate should be insulated. Aftera few seconds of running your machine, sparks willpass over every time…
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