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Updated: May 29, 2025
The nervous system, may in some respects be compared to a complicated system of telephony, in which the chains of neurons correspond to the wires, and the brain and spinal cord to the central station. Exercises.—1. Give the meaning of the term "coördination." Supply illustrations. What two general conditions are supplied in the body by the nervous system?
There is therefore no immediate danger that the art of telephony will be less fascinating in the future than it has been in the past. It will still be the most alluring and elusive sprite that ever led the way through a Dark Continent of mysterious phenomena. There still remains for some future scientist the task of showing us in detail exactly what the telephone current does.
"The same sort of waves that are employed in wireless telegraphy?" asked Tom. "Just the same, only in radio telephony we are confronted by a problem not met with in wireless telegraphy.
Its wires are waiting at the dock and the depot, so that a tourist may sit in his stateroom and talk with a friend in some distant office. It is one of the most incredible miracles of telephony that a passenger at New York, who is about to start for Chicago on a fast express, may telephone to Chicago from the drawing-room of a Pullman.
"I can see a universal system of telephony for the United States in the very near future," says Carty. "There is a statue of Seward standing in one of the streets of Seattle.
"What do you mean by frequency?" asked Tom. "Speaking in reference to radio telephony it means the number of electrical vibrations per second required to produce a certain sound. In electric currents 100 per second is a low frequency current, 100,000 per second is spoken of as high frequency.
Every one is familiar with Fritz Napoleon Smith's system a system made possible by the enormous development of telephony during the last hundred years. Instead of being printed, the Earth Chronicle is every morning spoken to subscribers, who, in interesting conversations with reporters, statesmen, and scientists, learn the news of the day.
The latter is then made to flow through a vacuum tube oscillator when it is converted into high frequency oscillations and these are varied, or modulated, as it is called, by a microphone transmitter such as is used for ordinary wire telephony. The energy of these sustained modulated oscillations is then radiated into space from the aerial in the form of electric waves.
The wireless telephone was used in addition to the long distance, and Secretary of the Navy Daniels, sitting at his desk at Washington, talked with Captain Chandler, who was at his station on the bridge of the U.S.S. New Hampshire at Hampton Roads. Whatever the future limitations of wireless telephony, there is no doubt as to the place it will take among the scientific accomplishments of the age.
And the antenna, I suppose, is on top of the rock above us. "This arc," he continued, advancing to the coils, "looks pretty strong and seems to have a rather elaborate water-cooling system. I think it is of foreign design, probably German. The Germans were early in the field with radio telephony development, you know."
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