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Updated: June 14, 2025
I will now describe two microphones in which there is a shaking or jolting motion, and loose contacts, and no variation of pressure of the carbons against one another, and both of these microphones when used with an induction coil and battery give most excellent articulation.
Edith Shaw was excited, too; the shoonoon were trying to estimate how soon they would be back to Bluelake by comparing the position of the Sky Fire with its position in the screen. General Maith received them in his private office at Army HQ; Foxx Travis mixed drinks for the four of them while the general checked the microphones to make sure they had privacy.
One of these microphones is made as follows: Two flat plates of carbon are secured to a block of cork, insulated from each other; into a hole of each carbon a pin of carbon fits loosely, projecting above the carbons; another flat piece of carbon, having two holes in it, bridges over the two lower carbons, being kept in its place by the pins of carbon which fit loosely in the holes in it, the bottom carbons being connected with the battery; a block of cork has a flat side of it cut out so as when secured to the lower cork the carbons will not come in contact with it, yet be close enough to it to keep the carbons from falling apart.
There are two of these tanks or "receivers" fitted against the ship's side, one on the port and one on the starboard side, near the bows, and as far down below the water level as is possible. The direction of sounds coming to the microphones hanging in these tanks can be estimated by switching alternately to the port and starboard tanks.
The children are watched every second. I even think there are microphones...." Soames scowled. "It's security," said Gail. "It would be taking too big a gamble to risk that the children can only receive sensory impressions and only through those little devices in their belts. Nobody's been able to make the belt-devices do more than that, but they can't be sure...."
It would have the mechanical equipment of microphones, searchlights, and other devices for detecting the approach of an enemy now employed successfully abroad. Its patrolling airplanes would cruise constantly far out to sea, not less than eighty miles, keeping ever in touch with their station.
It seemed somehow ominous, this lack of action from Tarrano; and when the leader of our line a tower vehicle rose sharply to scale the jagged peaks of the Divide, the flare of a hostile electronic bomb rising came almost as a relief. From the instrument room forewarned an instant by the hiss of our microphones I saw the bomb start upward.
In setting up the security system we checked all wiring, traced all phone lines, and in general made sure the place was not 'bugged, which is the term we use for wire taps, hidden microphones, and so on." Steve paused, and Rick thought his friend looked a little embarrassed.
Vibrations from a bell ringing at a distance fall on the iron side, travel through, and strike on two microphones hanging in the tank. These microphones transmit the sound along wires to the chart room, where telephones convey the message to the officer on duty.
Throughout the trip we had expected had anticipated the possibility of a surprise attack by Tarrano; an ambush in the open air, perhaps by some means strange to us. But the vision magnifiers, the microphones encompassing every known range of sight and sound showed us nothing. Especially at the mountains we had thought to meet opposition. But at first none came.
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