ould lead him to. Theprincipal conclusion is the existence of electromagnetic wavesin the ether of the kind we have already described. 129. Hertzs experiments.—The mechanism by whichthese waves propagate themselves can be seen by a considera-tion of the apparatus with which Hertz first studied… … * to each of which is attached a metal rod ending in a ball. Thetwo balls are placed close enough together so that when theinduction coil is operated a series of sparks pass between them. One may regard the rectan-gles of sheet metal as beingthe two plates of a condenser,the plates being opened…
Light
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