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This latter device may be either a telephone induction coil, a microphone transformer, or a magnetic modulator; the first two of these devices step-up the voltage of the battery current and the amplified voltage thus developed is impressed on the oscillations that surge through the closed oscillation circuit or the aerial wire system according to the place where you connect it.
Imperceptible ordinarily to even the most sensitive ear, to an ear trained it was comparatively easy to recognize the fall of the tumblers over this microphone. As he worked, the door behind him opened softly and the gray friar entered, closing it and moving noiselessly over back of the shelter of a big mahogany high-boy, around which he could watch. At last the safe was opened.
Again it was proved that the diaphragm or tympanum to receive the impression of the sound and convey it to the carbon button, on which Edison had laid considerable stress, was non-essential; for the microphone, pure and simple, was operated by the direct impact of the sonorous waves, and required no tympanum.
He was enthralled by the activity in the blockhouse, and, careful to keep out of the way, he walked from station to station. Now and then he looked through the thick glass ports, and he saw the green mist of boron hydride as fuel throbbed slowly into the rocket's tanks. A thin, bald scientist in a scarlet sports shirt picked up a microphone and spoke into it.
The Liberty came out a good ten thousand miles from its starting-point and beyond the area occupied by the enemy fleet. Three thousand miles away a flare burst among the distant stars. A second. A third. Six thousand miles away there were flashings in emptiness. "We're doing very well," said Bors calmly into the all-speaker microphone. "A little more care with the aiming, though.
In broadcasting a play from a theatre, when the speakers are moving about, the only way of dealing with the problem is to use several microphones and a mixing device which enables the engineer to change silently from one microphone to another, or to combine them in varying proportions. Some rapid switching may sometimes be necessary.
Again, the microphone, which renders the minutest movements audible, and which enables a listener to hear the footfall of a fly, has equipped the sense of hearing with the means of entering almost as deeply into the penetralia of nature, as does the sense of sight.
It wouldn't have taken a microphone, I suppose, to discover the hostility in my tone. "And would it be going too far to inquire just where you were?" I continued as I saw he had no intention of answering my first question. "I was at the Coast," he said, compelling himself to meet my glance. "I'm sorry that I cut your holiday short," I told him. "It was scarcely a holiday," he remonstrated.
"To use the old illustration, an electric impulse sent into the air spreads out in all directions just like the ripples from a stone chucked into a mill-pond," said Jack. "That's it," said Mr. Chadwick. "Now then, as you also know the wire telephone works by a metal disc in the receiver, vibrating in exactly the same way as does the microphone in the transmitter.
The market had closed and Constance was reading the account of the collapse as it was interpreted in the Wall Street editions of the papers, when the door opened and Brainard entered. "This has been a good day's work, Constance," he said, flinging himself into a chair. "Yes, I was just reading of it in the papers. The little microphone has put an entirely new twist on affairs.
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