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Updated: May 5, 2025
That made the two openings act somewhat like megaphone horns to still further magnify the sound which was emitted directly from this receiver without using any earpieces, and could be listened to anywhere in the room, if we chose. This was attached to the secret arrangement that had been connected with the telephone by replacing the regular by the prepared transmitter.
All that we need now is to find a place to install this receiving box all this stuff that is left over the two batteries, the earpieces. You see the whole thing is very compact.
Doctor Brainard got up. He went over to the corner where his overcoat hung upon a peg in the wall, and took from a pocket a small instrument composed mostly of tubes. He inserted certain earpieces in his ears and returned to the fire. "Sit up and let me get at you," he commanded. Brown glanced round, saw the doctor's grotesque appearance with the stethoscope in position, and shook his head.
One stepped from England into Ireland; and my prediction that the Irish would have something to say was correct. The first man who made his presence felt was a good six feet in height, with a heavy moustache and the earpieces of his cap tied under his chin, though the night was not cold.
I can get it down to six inches square and four inches thick, or I can have it arranged with earpieces so that at least six people can 'listen in' at once forms that can be used in detective work to meet all sorts of conditions.
Inside the glass gate, a man in a guard's uniform gave them each a pair of dark glasses. "Put them on now, boys. And don't look directly at the ship when it lands." Tommy hooked the earpieces of the dark glasses over his ears, and sighed with relief. Bart frowned, but finally put them on.
He recited something from the Orpheum revue, a line or two of a song, and the colonel heard distinctly every syllable. He replaced the earpieces where he had found them, closed the door of the box and that of the outer office, and led the way upstairs. The whisky still stood upon the table and he lifted a glass and drained it at a draught.
There was a little desk, a pair of receivers fastened to a headpiece, and a small vulcanite transmitter. "This is where he sat," said the colonel meditatively, pointing to a stool, "and this " he lifted up the earpieces "is how he heard all our very interesting conversations. Go upstairs, Pinto, I want to try this transmitter."
A low exclamation from Craig attracted my attention from Winters. In a corner he had discovered a small box and had opened it. Inside was a dry battery and a most peculiar instrument, something like a little flat telephone transmitter yet attached by wires to earpieces that fitted over the head after the manner of those of a wireless detector.
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