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In her bedroom, she opened a wall safe and swung out a high-powered transmitter. She switched the transmitter to active. "Yes?" said a voice. "Mihul here," said Mihul. "Quillan or the Commissioner...." "Quillan here," the transmitter said a few seconds later in a different voice, a deep male one. "Go ahead, doll." Mihul grunted.
Munro's successful applications of that portion of Professor Hughes' discovery possess an especial interest, and must to a considerable extent affect the aspect of litigation in future contests in which the discovery of the microphone and the invention of the carbon transmitter are vital points at issue.
An open circuit transmitter of this kind will send out waves that are four times as long as the aerial itself, but as the waves it sends out are strongly damped the Government will not permit it to be used. The Closed Oscillation Circuit.
Messel informs us that his first transmitter consisted of the bung of a beer barrel hollowed out in imitation of the external ear. The cup or mouth-piece thus formed was closed by the skin of a German sausage to serve as a drum or diaphragm.
Out of this incident arose a struggle and a controversy whose echoes are yet heard as to the legal and moral rights of the two inventors, the assertion even being made that one of the most important claims of Gray, that on a liquid battery transmitter, was surreptitiously "lifted" into the Bell application, then covering only the magneto telephone.
When vibrations of speech impinged upon the resonant surface its rhythmic light-vibrations were broken, just as a telephone transmitter breaks an electric current. Simultaneously these light-vibrations were changed into sound on the surfaces of all spheres tuned to that particular instrument.
"The parabolic reflector over there catches these light vibrations and focuses them on the cell of selenium which you perhaps noticed in the centre of the reflector. You remember doubtless that the element selenium varies its electrical resistance under light? Thus there are reproduced similar variations in the cell to those vibrations here in this transmitter.
"Are you going to be back in the dome by lunchtime?" "I think so. Might have some interesting news, too, incidentally." "Fine," she said. "See you then." Twenty minutes later the desk transmitter gave her the "to be shielded" signal. Up went the barrier again. Major Quillan's face looked out at her from the screen. He was, Trigger saw, in Mantelish's lab.
There was not the slightest sound. But Hilary was taking no chances. With infinite slowness he raised his head over the matted underbrush that masked the entrance. For the moment he could see nothing in the pitchy blackness. Then a dim shape loomed to one side. From within it there came a tiny hum, intermittent, almost inaudible. Hilary knew what that was: a transmitter.
The physicist smiled when Arcot was finished, and tried to reply, but he was not a good transmitter. Torlos aided him. "He says that the science of your people is far ahead of us. The conceptions are totally foreign to his mind, and he can only barely grasp the significance of the idea of bent emptiness that you have given him.
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