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By -JOHN B. BRADY
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Navy Department is enthusiastic over the results of experiments conducted during the past year with a system of printing by radio| whereby an operator can manipulate a keyboard resembling that of a typewriter and transmit radio signals automatically, which, received at a distant radio station, are set down simultaneously in print. The messages come through clearly and accurately, as can be seen by the reproduction of one of the first messages transmitted by this system.
The achievement of radio printing has been brought about by the cooperation of the Morkrum Company of Chicago with the Bureau of Engineering, Navy Department at Washington. The Morkrum .Company manufactures the Teletype (Figs, i and 2), the invention of C. L. and H. L. Krum. It is a simple keyboard transmitting machine and printer unit, originally developed for operation in wire telegraphy. The levers of the keyboard are arranged to control the lateral movement of a set of five selector bars within the base of the machine. These selector bars are so notched that certain of them will slide endwise when a particular key is pressed and con
Many of you who have read that printing by radio is a practical reality may be curious to know just how this "radio typing" is accomplished. Pressing letter a on the keyboard causes a letter a to be typed gn a paper strip at a radio receiving station miles away: it sounds almost too easy. Modern efforts in the field of mechanics are making processes continually simpler: (whether life in general is made simpler or more complicated as a result is another matter), and although any real radio amateur would find more satisfaction in caressing a "bug" than in using the Hunt & Peck system on a typewriter transmitter, the Teletype gives an element of precision to radio communication which should be exceedingly important, as Mr. Brady shows, to such departments as our Army, Navy, and Air Mail Service. — THE EDITOR.
trol the position of locking latches and contact levers mounted upon the base of the unit. A motor, driven from a generator or a storage battery and mounted on the unit, has a driving shaft which rotates a set of cams against contact leaf springs pushed forward by the depression of a particular key. In operation, the contacts close in sequence according to the letters to be transmitted. Each contact gives a brief
interval of complete circuit connection, causing an impulse to be radiated from the antenna. The sequence of impulses distinguishes the letters of the alphabet. Mounted on the base of the keyboard, the printer unit, a small mechanical brain in itself, is controlled by the operation of an armature attracted in a sequence of intervals by Teletype magnet coils. The operation of the armature results in the positioning of a type wheel opposite a paper tape for printing a character represented by the impulses received by the Teletype magnets.
Two sets of Teletype equipment were loaned by the Morkrum Company to the Navy Department for research on the printer system. Commander S. C. Hooper, Head of the Radio Division, Bureau of Engineering, Navy De
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Showing how clearly these words, sent during the first experiments, were automatically printed by the Teletype