Abstract
A CERTAIN amount of experimenting has been done from time to time on the transmission of sketches, photographs, etc., electrically along ordinary telegraph circuits, but in the case of long lines success has been limited by the difficulty of obtaining sufficiently sharp current impulses owing to the capacity effects in the line. This difficulty disappears with wireless transmission, and it is chiefly for this reason that the author anticipates greater success, as well as greater convenience, in the apparently more delicate methods which it is his purpose to describe. In his own system a bichromate print made on a metal film is rotated on a drum at the same time fed axially, and a stylus is caused by the presence of the picture to make intermittent contact and to send a series of impulses from an ordinary wireless transmitting set. A synchronised drum at the receiving end carries a photographic film, and a beam is directed on to it, which is made intermittent by the movement of a small shutter controlled by the receiving apparatus. Considerable ingenuity has been exerted to overcome the many practical difficulties encountered.. The additions to this the second edition relate chiefly to optical and photographical matters.
Wireless Transmission of Photographs.
By Marcus J. Martin. Second edition, revised and enlarged. Pp. xv + 143. (London: The Wireless Press, Ltd., 1919.) Price 5s.
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Wireless Transmission of Photographs . Nature 105, 451 (1920). https://doi.org/10.1038/105451c0
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DOI: https://doi.org/10.1038/105451c0