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Updated: May 15, 2025
Accordingly I gave the subject of sound-waves my best thought, and the next morning I had formulated clearly laid principles upon which to work. By these I hoped to make an instrument that would be the means of conversing with a Martian.
It was observed that when the strip was moved very rapidly the vibration of the lever resulted in the production of an audible note. With these facts before him, Edison reasoned that if the paper strip could be imprinted with elevations and depressions representative of sound-waves, they might be caused to actuate a diaphragm so as to reproduce the corresponding sounds.
In the explosion of gunpowder in St. John's Wood, many houses in the back streets had their windows broken; for the sound-waves bounded off at angles from the walls and struck back upon them.
To the naked eye, the record of the sound appears to be simply a line of pin points or dots, more or less close to each other; but, under a magnifier, it is seen to be far more complicated. Now for the reading. The impression on the foil exactly records the vibrations of the diaphragm, and those vibrations exactly measure the sound-waves which caused the vibrations.
With Edison's telephone the sound-waves simply actuate an electric valve, so to speak, and permit variations in a current of any desired strength.
And now the still air was lashed into a fury of sound-waves, tearing this way and that in twenty keys; now the sleeping garden was torn by rushing figures, helter-skelter for life and honour. Sounds! the melancholy bellow of that gardener, Mr.
Think of the patter of the rain, how each drop as it hits the pavement sends circles of sound-waves out on all sides; or the loud report which falls on the ear of the Alpine traveller as the glacier cracks on its way down the valley; or the mighty boom of the avalanche as the snow slides in huge masses off the side of the lofty mountain.
Now suppose the wall were so far behind you that the reflected sound-waves only hit upon your ear after those coming straight from me had died away; then you would hear the sound twice, "Ha" from me and "Ha" from the wall, and here you have an echo, "Ha, ha."
As the sound-waves from the speaker's voice strike against the diaphragm, which has become magnetic from its nearness to the magnet pole, electric currents are generated in the coil of wire surrounding such pole, since the to-and-fro motions cause the lines of electro-magnetic force to pass through the wire on the moving coil. The operation of the receiving instrument is also readily understood.
Certain sound-waves have reached the ear, a series of physical changes have taken place within the organism, special groups of muscles have been called into play, and the body of the cat has changed its position on the floor. Is it asserted that this chain of physical changes is not at all points complete and sufficient in itself?" I have been led to turn to this article of Mr. Spalding's by Mr.
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