Signalling through space without wires : being a description of the work of Hertz & his successors . nd so on. * Strictly speaking, in the waves themselves there is no lag or differenceof phase between the electric and the magnetic vibrations ; the differenceexists in emitter or absorber, but not in the transmitting medium. Trueradiation of energy does not begin till about a quarter wave-length fromthe source, and within that distance the initial quarter period difference ofphase is obliterated. 6 SIGNALLING WITHOUT WIRES. All this was known, I say, known with varying degrees ofconfidence; but
Signalling through space without wires : being a description of the work of Hertz & his successors . nd so on. * Strictly speaking, in the waves themselves there is no lag or differenceof phase between the electric and the magnetic vibrations ; the differenceexists in emitter or absorber, but not in the transmitting medium. Trueradiation of energy does not begin till about a quarter wave-length fromthe source, and within that distance the initial quarter period difference ofphase is obliterated. 6 SIGNALLING WITHOUT WIRES. All this was known, I say, known with varying degrees ofconfidence; but by some known with as great confidence as,perhaps even more confidence than, is legitimate before theactuality of experimental verification. Hertz supplied the verification. He inserted suitable con-ductors in the path of such waves, conductors adapted for theoccurrence in them of induced electric oscillations, and to thesurprise of everyone, himself doubtless included, he found thatthe secondary electric surgings thus excited were strong enoughto dispiay tioxiiselves by minute electric
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