Upon the Production of Sound By Radiant Energy

Cover Upon the Production of Sound By Radiant Energy
Upon the Production of Sound By Radiant Energy
Alexander Graham Bell
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12 the converse process takes place. The lamp-black particles cool and contract, thus enlarging the air spaces among them, and the enclosed air also becomes cool. Under these circum- stances a partial vacuum should be formed among the particles, and the outside air would then be absorbed, as water is by a sponge when the pressure of the hand is removed.
I imagine that in some such manner as this a wave of con- densation is started in the atmosphere each time a beam of sun- light falls upon lamp
...-black, and a wave of rarefaction is origi- nated when the light is cut off. We can thus understand how it is that a substance like lamp-black produces intense sonorous vibrations in the surrounding air, while at the same time it communicates a very feeble vibration to the diaphragm or solid bed 'upon which it rests.
This curious fact was independently observed in England by Mr. Preece, and it led him to question whether, in our experi- ments with thin diaphragms, the sound heard was due to the vibration of the disk or (as Prof.


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