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Updated: June 12, 2025
The astonishing feats performed by the transmitters of ancient poems and religious teachings seem to us incredible. Professor Max Müller says that the voluminous Vedas have been handed down for centuries, unchanged, simply from mouth to mouth by the priesthood. Every progressive race, until it has attained a high development of the art of writing, has manifested similar power of memory.
Condensers for spark telegraph transmitters can be ordinary Leyden jars or glass plates coated with tin or copper foil and set into a frame, or they can be built up of mica and sheet metal embedded in an insulating composition. The glass plate condensers are the cheapest and will serve your purpose well, especially if they are immersed in oil.
Seventh " ............. Seattle, Wash. Eighth " ............. Detroit, Mich. Ninth " ..............Chicago, Ill. Kinds of Transmitters. There are two general types of transmitters used for sending out wireless messages and these are: wireless telegraph transmitters, and wireless telephone transmitters.
Then they saw the transmitters that could shoot radio messages into space, and hung entranced over the moving pictures of what happens in a vacuum tube. Nothing escaped them, and they "did" the show thoroughly, so thoroughly in fact that at the end they were, as Joe expressed it, "all in."
Kennedy removed the transmitters of the telephones, and taking the carbon capsules from them placed the capsules on the table carefully. Then he lifted down the etching from the wall and laid it flat on its face before us. Quickly he removed the back of the picture.
Seventh " ............. Seattle, Wash. Eighth " ............. Detroit, Mich. Ninth " ..............Chicago, Ill. Kinds of Transmitters. There are two general types of transmitters used for sending out wireless messages and these are: wireless telegraph transmitters, and wireless telephone transmitters.
In the first part of this book we learned about spark-gap telegraph sets and how the oscillations they set up are damped and the waves they send out are periodic. In this and the next chapter we shall find out how vacuum tube telegraph transmitters are made and how they set up oscillations that are sustained and radiate waves that are continuous.
"Those current interrupters are the things which have since become known as transmitters," explained Mr. Hazen. "Those Mr.
But Avlis was 'in the news' long before the Greek broadcasting service decided to install its short wave transmitters there. In ancient times a great fleet of ships had been assembled in the harbour there, ready to set sail for Troy, following the abduction of the beautiful Helen of Sparta by Paris, the young Prince of Troy. But there had been no wind for many weeks, and the sea was dead calm.
Bell had trained his ear to sounds until it was abnormally acute, he was tuning the springs of the receivers to the pitch of the transmitters, a service he always preferred to perform himself. To do this he placed the receiver against his ear and called to Watson, who was in the adjoining room, to start the current through the electromagnet of the corresponding transmitter. When this was done, Mr.
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