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Joe introduced his friends in hurried, boy fashion, and a moment later they were helping the old gentleman out of the house and into the automobile, at the same time pouring into his interested ears such tales of the marvels of radio telephony that it was a wonder they did not talk the veteran deaf. In the confusion Bob managed to whisper instructions to Joe.
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 arrangement of cars is as follows: At the forward end the control car is slung, which contains all navigating instruments and the various controls. Adjoining this is the wireless cabin, which is also fitted for wireless telephony. Immediately aft of this is the forward power car containing one engine, which gives the appearance that the whole is one large car.
Herbert Spencer, in his autobiography, alludes to the impressive fact that while the eye is reading a single line of type, the earth has travelled thirty miles through space. But this, in telephony, would be slow travelling. It is simple everyday truth to say that while your eye is reading this dash, , a telephone sound can be carried from New York to Chicago.
Helmholtz had performed this experiment simply to demonstrate the physical basis of sound, and seems to have had no idea of its possible use in telephony. That an electro-magnet could vibrate a tuning-fork and so produce sound was an entirely new and fascinating idea to the youth. It appealed to his imagination, quickened by his knowledge of speech.
No other thing is more enswathed in the unknown. Not even the gray-haired pioneers who have lived with the telephone since its birth, can understand their protege. As to the why and the how, there is as yet no answer. It is as true of telephony to-day as it was in 1876, that a child can use what the wisest sages cannot comprehend. Here is a tiny disc of sheet-iron. I speak it shudders.
Even though this young man at Menlo Park had done some wonderful things for telegraphy and telephony; even if he had recorded and reproduced human speech, he had his limitations, and could not upset the settled dictum of science that the internal resistance must equal the external resistance. Such was the trend of public opinion at the time, but "after Mr.
It was discovered by an inventor several years ago, while experimenting in telephony. "There are no disks or cylinders of wax, as in the phonograph, but two large spools of extremely fine steel wire. The record is not made mechanically on a cylinder, but electromagnetically on this wire.
The exhibits, forming a remarkable demonstration of the breadth of applied science, embrace electrical means of communication, including wireless telegraphy and telephony, musical instruments, chemistry, photography, instruments of precision and of surgery, theatrical appliances, engineering, architecture, map-making, typography, printing, book-binding, paper manufacture, scientific apparatus, typewriters, coins and medals, and innumerable other articles.
Chadwick, "we find that the problem in radio telephony is the same as that met with in ordinary wire telephony. That is to say, we are required to cause a distant metal disc to repeat every inflection of the transmitter. But in the case of radio telephony the result is to be obtained by Hertzian waves, instead of by a current passing through an insulated wire."
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