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Updated: July 17, 2025
The paper and tin-foil are then pressed together and impregnated with an insulating compound. A fixed condenser of the exact capacitance required for connecting across the head phones is mounted in a base fitted with binding posts, as shown at B, and costs 75 cents.
Among their adventures was the rescue of little Patty Graham, child of a rich broker who was camping in the woods, from the half-breed LeBlanc. As a reward for their brave deed, Mr. Graham presented them with a specially made wireless telephone outfit, complete with home station and compact carrying 'phones. Now that we know who our heroes are, let us hear what the Customs Chief has to tell them.
For this set get a crystal detector, a two-slide tuning coil, a fixed condenser, and a pair of 2,000 ohm head phones. Mount the detector on the right-hand side of a board and the tuning coil on the left-hand side.
The device is expected to simplify and speed the hooking together of automatic and voice-hand-operated telephone exchanges, and also to speed long-distance calls from automatic phones through rural exchanges.
The finny fellows bit greedily and in a short time they had enough black bass and pickerel to feed a party twice the size of theirs. After supper all repaired to the cabin, and the boys donned phones, while Cub started a broadcasting campaign in search of information regarding the two Canadian wireless contestants, who seemed to have made a trio of monkeys out of the three radio motor-boat boys.
"How about this?" bellowed the mayor. "Hayden's squealed. Phones to Bland not to me. Whines about the courts I don't know what rot. He's squealed. He didn't phone the combination." "The rat!" screamed Mr. Max. "By the Lord Harry," said the mayor, "I'll have it open, anyhow. I've earned what's in there, fair and I've earned it. I'm going to have it, Max." "See here, Cargan " put in Mr. Bland.
Now close the switch of the buzzer circuit, put on your head phones, and move the wire point of the detector to various spots on the crystal until you hear the sparks made by the buzzer in your phones. Then vary the pressure of the point on the crystal until you hear the sparks as loud as possible.
Crowninshield, phones at his ears and microphone at his lips, was staring intently into his own plate. "Kinda think I'll do most of it from here, but you can't always tell. If they get inside my guard you all know what to do." "All x."
In ordinary planes the crew cannot talk to each other except by using phones or putting their lips to each other's ears and yelling at the top of their voices, according to what John and Tom tell me. But we don't expect to have that trouble in this enclosed cabin and with this new muffler working, do we, fellows?" "I'm sure we won't," said John. "Not if I'm any judge," grinned Tom.
A third challenge is to keep the inexorable march of technology from giving terrorists and potentially hostile nations the means to undermine our defenses. The same advances that have shrunk cell phones to fit in the palms of our hands can also make weapons of terror easier to conceal and easier to use.
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