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BEFORE THE BAIRD "TELEVISOR" In spite of the miles of type expended on television, it is not yet possible by any \nown system to receive images which have much detail. All the systems \nown are generally similar. Although it is possible for experimenters to construct simple receivers to pic\ up television signals, "when, as, and if" transmitted, the results are difficult to achieve. The illustration shows Mrs. Howe, said to be the first woman whose features were "televised" across the Atlantic by the Baird system
Author of "The Hysterical Background of Radio"
THE promise of television is that we may see events as they occur, no matter where we are, provided we have a television receiver and provided, also, that a televisor operator is present at the event. Televising is the broadcasting of images, the annihilation of distance for the eye as aural radio has done for the ear. In place of the microphone we want to use the camera lens together with some device that translates light reflected from the object, into electric current impulses which speed to our receiver where those impulses are translated back into light and are projected on a screen
This is the promise. It seems so simple. Yet long before regular broadcasting of programs commenced, we were as far ahead in method as we are now. It violates no confidence to say that only within the last month one of the most prominent workers has abandoned the problem in favor of research on the facsimile transmission of telegrams. Another. C. Francis Jenkins, writes that it is a stubborn problem but the solution seems to be right around the corner. In England, Sir Oliver Lodge raises a note of warning against the public expecting success, stating that other scientists are in accord with him. Theodor
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EIGHTEEN LINES TO THE INCH This drawing shows what slight modulaation is required to portray the features. The image received in some television outfits is no larger than the actual size of the cut above. The reader may imagine the detail of the received picture where the image of an entire head, for example, must be included in this space
Nakken, whose researches have made the photoelectric tube available for this work, states flatly that the thing is impossible with the methods now being tried, except at enormous costs. With this weight of authority against success, let us look for a moment at the problem.
The eye is a camera, but a very defective one. It retains an impression for a definite period, normally about one-tenth of a second, and because of this, moving pictures are possible. On the other hand, an impression must affect the eye for a certain definite minimum of time, depending upon the intensity of light, or it won't register in the consciousness at all. This makes possible the magician's tricks in dim light, and makes almost impossible the achievement of television.
To see any image dot by dot, the first essential is that the eye must see each dot for a period long enough to awake the consciousness, and yet it must see the last dot of the image before the impress:on of the first dot is lost. To put this in figures means that the last dot must be shown within a tenth of a second after the first dot, and yet each dot must appear for at least the fivehundred-thousandth part of a second, strongly
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