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We can only surmise some system of insulating screens or focal mirrors. I might remark in passing that the existence of this power to direct or focus the more rapid ethereal vibrations would be a discovery of considerable scientific moment. But if this is the method employed, why do we not cut a band of vibratory nullifications, rather than touch upon a focal point?"
The coarse, angular, unyielding twigs of the oaks give deep tones like the vibrations of the thick strings on the big double bass. The opposite, widespreading twigs of the ash sing like the cello, and the tones of the alternate spray of the lindens are finer, like the viola.
It will be noted that, as I resolved the phenomena of heredity into phenomena of personal identity, and left the matter there, so Professor Hering resolves the phenomena of personal identity into the phenomena of a living mechanism whose equilibrium is disturbed by vibrations of a certain character and leaves it there. We now want to understand more about the vibrations.
By a suitable arrangement, moreover, it is possible to make one sound wholly extinguish another. Along four distinct lines, for example, the vibrations of the two prongs of a tuning-fork completely blot each other out. The pitch of sound is wholly determined by the rapidity of the vibration, as the intensity is by the amplitude.
It was so utterly dark, and yet such a naked statement, that rapid vibrations ran through his blood and over his brain, he was no longer responsible. Still her voice rang on like a bell, tinged with a tone of mockery. And as she swung her head, her fine mane of hair just swept his face, and all his nerves were on fire, as with a subtle friction of electricity.
Stevens found the probing frequency in his range and they flashed their own beam along it, encountering finally one of the monstrous Vorkulian fortresses, far from Jupiter and almost directly between them and the planet! Its wall screens were in operation, and no frequency at their command could penetrate that neutralizing blanket of vibrations.
We are for the moment lifted out of squalor, vagrancy, and disorder, and seem to hear some of the harmonies which sounded to this perturbed spirit, soothing it, exalting it, and stirring those inmost vibrations which in truth make up all the short divine part of a man's life.
But, except by originating motion, we cannot act at all. And, accordingly, throughout all science the attempt is made to reduce all phenomena to motions. Sounds, colours, heat, chemical action, electricity, we are perpetually endeavouring to reduce to vibrations or undulations, that is, to motion of some sort or other.
But yet I was not. The vibrations of the carriage, with its hard springs and iron-tired wheels, registered accurately and plainly the character of the roadway.
"The parabolic reflector over there catches these light vibrations and focuses them on the cell of selenium which you perhaps noticed in the centre of the reflector. You remember doubtless that the element selenium varies its electrical resistance under light? Thus there are reproduced similar variations in the cell to those vibrations here in this transmitter.
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