Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 15, 2025
The world was asleep or seemed so although for fifty living organisms in Nature that sleep there are a thousand that wake, to whom night is the working day. I listened, and fancied I could hear the delicate murmuring of voices hidden among the leaves and behind the trees, and the thrill of soft music flowing towards me on the sound-waves of the air.
This work was actively developed between the years 1890 and 1898, and its difficulties may be appreciated when the problem is stated; the copying from a single master of many millions of excessively minute sound-waves having a maximum width of one hundredth of an inch, and a maximum depth of one thousandth of an inch, or less than the thickness of a sheet of tissue-paper.
I listened intently, thinking that if the sound-waves were of the nature of the electrical-waves we employ in the wireless system, I would still be in touch with my newly found friend, but I heard no further sound from the instrument, thus proving that these waves also were projected by the mysterious agent known only to the Martians.
For in the ear the sound-waves are first of all taken over by the so-called ossicles, three small bones in the middle ear which, when examined with the Goethean eye, appear to be a complete metamorphosis of ah arm or a leg.
Sometimes the roll is made even longer by the echo, as the sound-waves are reflected to and fro by the clouds on their road; and in the mountains we know how the peals echo and re-echo till they die away. We might fill up far more than an hour in speaking of those voices which come to us as nature is at work.
Now, as this membrane is driven to and fro by the sound-waves, it naturally shakes the air in the cavity behind it, and it also sets moving three most curious little bones. The first of the bones is fastened to the middle of the drumhead so that it moves to and fro every time this membrane quivers.
I wish I'd heard you in your frenzy, Percival, though I have less faith in speeches and principles than she has. Reform is only a seed, you know, and most seeds never come to maturity or bear fruit. So most people justly doubt the reformer." "Do you think we're thin sound-waves who do nothing but vibrate?" said Dick. "Not at all; but I mean there are no such things in the world as abstractions.
The most familiar illustration of the interference of sound-waves is furnished by the beats produced by two musical sounds slightly out of unison. When two tuning-forks in perfect unison are agitated together the two sounds flow without roughness, as if they were but one. But, by attaching with wax to one of the forks a little weight, we cause it to vibrate more slowly than its neighbour.
Now it occurred to Professor Hughes that, if this were so, it might be possible to cause the air-vibrations of sound to so act upon a wire conveying a current as to stretch and contract it in sympathy with themselves, so that the sound-waves would create corresponding electric waves in the current, and these electric waves, passed through a telephone connected to the wire, would cause the telephone to give forth the original sounds.
As the diaphragm vibrated under the sound-impulses the pressure upon the carbon granules was varied. An electric current was passed through the carbon particles, whose electrical resistance was varied by the changing pressure from the diaphragm. Thus the current was thrown into undulations corresponding to the sound-waves, and passed over the line and produced corresponding sounds in the receiver.
Word Of The Day
Others Looking