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Updated: July 17, 2025
He seemed chilled and very much worried. He looked wistfully ahead at the graveyard where the strange, soft, reflected light shone. "The people around here haven't got any 'phones," he said. "Anyways what's the use 'phoning Mr. Bartlett because he'll only be in bed. If we're going straight to Bridgeboro, gee whiz, what's the good of 'phoning?
"You can buy out my whole arsenal on that explanation." "We won't need it," Mr. Perry smiled. "These two guns are enough." The purchase completed, the two men and the boy left the store and hastened on toward the municipal docks. Meanwhile Max arrived at his home and went direct to his radio room. There the first thing he did was to don his phones, and the result was instantly startling.
There were several automatic 'phones in the place, and they were used very often during the day by the public. The drug clerks took little or no notice of the persons entering or leaving the booths, since the dropping of a coin in the slot was all that was necessary to be connected with central. "Well, we've got to wait for the second call here," said Tom, who had been busy during Ned's absence.
About five P.M., though, Miss Prescott 'phones over her regrets, sayin' how her nephew had arrived unexpected; so of course she gets the word to bring Dudley Byron along with her. Emerson, his last name is, and while I hadn't seen much of him lately we'd been more or less friendly when he was takin' special post-graduate work at some agricultural college and was around home durin' vacations.
Ferberton, came out with an offer of a prize of one hundred dolllars for the best amateur wireless outfit made by any boy in his district, and a second prize of fifty dollars. It was stipulated that the entire set, outside of the head phones, must be made by the boy himself, with out any assistance from grown-ups.
You are now prepared to mount the various instruments in their proper locations. For your table instruments, get a good pine board about seven-eighths of an inch thick. Buy four binding posts and use one for the aerial wire, one for the ground wire, and two for the phones or head set.
Where radio frequency or audio frequency amplifiers are used to couple your amplifier tubes in cascade you must take particular pains to shield them from one another in order to prevent the feed back of the currents through them, which makes the head phones or loud speaker howl.
With a vacuum tube detector, and especially with one having a gas-content, a potentiometer is very necessary as it is only by means of it that the potential of the plate of the detector can be accurately regulated. The result of proper regulation is that when the critical potential value is reached there is a marked increase in the loudness of the sounds that are emitted by the head phones.
In this chapter we shall go only into the apparatus used for two simple receiving sets, both of which have a crystal detector. The first set includes a double-slide tuning coil and the second set employs a loose-coupled tuning coil, or loose coupler, as it is called for short. For either set you can use a pair of 2,000- or 3,000-ohm head phones. The Crystal Detector.
The Hans followed a peculiar system in the command of their ships. Each ship had a double complement of officers. Active Officers and Base Officers. The former were in actual, active charge of the ship and its apparatus. The latter remained at the ship base, at desks equipped with viewplates and phones, in constant communication with their "correspondents," on the ship.
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