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"You guys can come in now," said Haney's voice in Joe's headphones. "It's all okay. Mike's pumping out the other locks too, so you can come in at any of 'em." The space-suited figures clumped loudly to airlock doors. There were a dozen or more small airlocks in various parts of the hull, besides the great door to admit supply ships.
He knew from Diane's expression that there was no sound in the headphones except the frying noise all main-sequence stars give out, and the infrequent thumping noises that come from gas-giant planets' lower atmospheres, and the Jansky-radiation hiss which comes from everywhere. The skipper swore. The Plumie ship lay broadside to, less than a score of miles away. It shone in the sunlight.
These extra and larger currents which are the result of the feedback then act on the grid and cause still larger variations of the current in the plate voltage and hence of the current of the B battery that flows through the detector and the headphones. At the same time the tube keeps on responding to the feeble electric oscillations set up in the circuits by the incoming waves.
Cochrane wore headphones carrying what the communicator carried, as this broadcast went through an angled Dabney field relay system back to Lunar City and then to Earth. He spoke close to Jamison's ear. "Go ahead! If your voice fades, it will be the best possible sign-off. Suspense. Good television!" Jamison let the throat-mike back against his skin.
It consists of a brass horn with a curve in it and in the bottom there is an adapter, or frame, with a set screw in it so that you can fit in one of your headphones and this is all there is to it. The construction is rigid enough to prevent overtones, or distortion of speech or music. Another Simple Kind of Loud Speaker.
They happened to be the only crew alive who had ever flown a space ship designed for maneuvering, and their experience consisted of a single trip. The jet stream was higher this time than on that other journey now two months past. They blundered into it at 36,000 feet. Joe's headphones buzzed tinnily.
Shunt the potentiometer around the A battery and connect the sliding contact with the or zinc pole of the B battery and the + or carbon pole with one terminal of the headphone; connect the other terminal to one of the posts of the variometer and the other post of the variometer to the plate of the detector. Finally shunt a .001 mfd. fixed condenser around the headphones.
The higher the negative charge on the grid the smaller will be the number of electrons that will reach the plate and, of course, the smaller will be the amount of current that will flow through the tube and the headphones from the B battery.
Where two or more headsets are used with one wireless receiving set they must all be of the same resistance and connected in series, that is, the coils of one head set are connected with the coils of the next head set and so on to form a continuous circuit. The Impedance of Headphones.
This is because oscillations are set up only when the plate is energized with the positive part of the alternating current and this produces an intermittent musical tone in the headphones. Hence this kind of a sending set is called a tone transmitter.
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