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Radio Broadcast
Belin announced the successful conclusion of his efforts to transmit pictures by radio. Now we have pictures across the Atlantic. The Radio Corporation of America has succeeded in sending some quite recognizable portraits from Carnarvon, Wales, to Riverhead, Long Island. High power is used so that the signal received in America is reasonably large compared with static disturbances, and in this way the blotchy appearance which is sometimes caused by atmospheric disturbances has been practically eliminated.
The general scheme used is the same as before: light from (or through) the portrait to be transmitted falls on a sensitive photoelectric cell. The action of this cell controls the intensity of the signal sent from the transmitting antenna. The light beam used is very small (only about one hundredth of an inch square) so that it covers only a very small
THE u.s.s. "TEXAS"
Showing the elaborate radio antenna system, which is used to dispatch the very considerable radio traffic necessary on practically every naval vessel
part of the portrait at one time. By moving the picture past the light beam back and forth and having quite similar receiving apparatus actuated from the received signal, a picture is formed by packing together a series of shaded lines. It takes about three seconds to draw one line completely across the picture, and as there are about 100 lines per inch it may be figured out that to transmit a picture about three inches square requires twent minutes.
Fixing the charge for picture service by the amount a station could earn in a similar time by transmitting telegraph signals, each picture would cost about $50. Most of us will evidently send our pictures by mail for quite some time to come, but newspapers may well use this picture service. The same apparatus can be used for sending the written or printed word, and it may turn out that, with the improvements which are sure to come, one can send a message faster by this photographic scheme than it is. by the present dot and dash code.
It is not quite clear from the announcement made by the Company just what its engineers have contributed to this photograph transmission development. Practically the same process as that outlined has been used before for picture transmission, but it is quite possible that valuable additions to the progress of the art have been made in synchronizing the sending and receiving apparatus, and in eliminating the blotches caused by atmospheric disturbances. After the transmission has once started, it is essential in anv