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Updated: June 9, 2025
For this small transmitter you can use an ordinary buzzer as shown at F. A dry cell or two must be used to energize the buzzer. You can get one for about 75 cents. The Telegraph Key. Any kind of a telegraph key will serve to break up the trains of sustained oscillations into dots and dashes. The key shown at G is mounted on a composition base and is the cheapest key made, costing $1.50.
Adjusting the No. 2 Set. First adjust the crystal detector with the buzzer set as described above with Set No. 1, then turn the knob of your variable condenser so that the movable plates are just half-way in, pull the secondary coil of your loose-coupled tuner half way out; turn the switch lever on it until it makes a contact with the middle contact point and set the slider of the primary coil half way between the ends.
Well, there was Guthrie Parham, he came on at 1245, and his sponsor was all right. He'd call Parham and tell him what he wanted done. The buzzer warned him that he was approaching the lower Manhattan beacon; he shifted to manual control, dropped down to the three-thousand-foot level, and set his selector beam for the signal from Pelton's Purchasers' Paradise.
"A friendly little game," she speculated. "What IS the game?" That night found Constance at the buzzer beside the heavy mahogany door across the hall. She wore a new evening gown of warm red. Her face glowed with heightened color, and her nerves were on the qui vive for the unlocking at last of the mystery of the fascinating Mrs. LeMar.
"Now the fire-houses in the particular district where that fire is have received the alarm instantly. Four engines, two hook-and-ladders, a water-tower, the battalion chief, and a deputy are hurrying to that fire. Hello, here comes another." Again the buzzer sounded. "One," "four," "five" showed in the annunciator. Even before the clerks could respond, McCormick had dragged us to the door.
There he found the buzzer of his little desk-telephone intermittently calling him. "Yes, hello?" he answered, receiver at ear, as he sat down in the swivel-chair of aluminum with its hydrogen cushion. The voice of the wireless man, Menendez, reached him. In a soft, Spanish-accented kind of drawl, Menendez said: "Just picked up two important radios, sir." "Well? What are they?"
While no sound can be heard in the headphones at the receiving station so long as the points of the key are not in contact, when they are in contact the oscillations are modulated and sounds are heard in the headphones that correspond to the frequency of the buzzer in the key circuit. The Operation of C. W. Telegraph Transmitters with Direct Current.
An alarm buzzer went off suddenly, and an urgent voice came out of the box on the wall: "Here come the goons! South escalator!" Prestonby grabbed a burp gun and a canvas musette bag full of clips. By the time he had gotten down to what, in deference to the superstitions of the Illiterate store force, was known as the fourteenth floor, an attack on the north escalator had developed as well.
The whistling continued with occasional interruptions as though the whistler were about some work or other. And then suddenly "Buzzer" Barling, holding something in one hand and rubbing violently with the other, stepped into the patch of light between the window and the bed in Desmond's bedroom. Desmond's heart leaped within him. Here was assistance close at hand.
So I 'phones to him and he, the poor fool, he admits it! He says after my lease was all signed he got a better offer from another fellow and he wanted my lease back. Now what you going to do about it?" "Your name is ?" "William Varney W. K. Varney." "Oh, yes. That was the Garrison house." Babbitt sounded the buzzer. When Miss McGoun came in, he demanded, "Graff gone out?" "Yes, sir."
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