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Radio Broadcast
been formulated for its operation. Still another use of the vacuum tube has been developed to an extent which shows excellent
promise. It is now thought that it can be included in the design of a new and novel receiving circuit which will be a great improvement in the sensitivity as compared to presentday receivers. Many patents are now pending for the various inventions which have been made in connection with the Cooley system. As rapidly as the patent work permits, Radio Broadcast will disclose the technical developments that are made as the work progresses.
There has been much discussion in recent years about the theories of the German scientist Einstein and his theory of the relativity of time and space. In a very definite and striking way, the radio transmission of photographs illustrates the contentions of that famous scientist, although certainly not in the way he intended.
This new art has reached the stage where commercial telephone, telegraph, and radio companies must recognize it as an ally or prepare to meet its competition. The constant barrier of distance is again about to be dealt a blow as deadly as that delivered by the general utilization of the locomotive, automobile, airplane, the telegraph, and radio. Since time is the only important measure of geographical space, phototelegraphy bids fair appreciably to shrink the magnitude of our world.
CALVIN COOLIDGE
President of the United States. This photograph was also sent across the Atlantic by the Ranger system. The dots and lines which go to make the picture can be clearly seen.
/^OMPLETE instructions on how to build the Roberts jour-tube Knockout receiver so that it can be fitted into any phonograph cabinet will appear in an early number of RADIO BROADCAST. It is now possible to buy manufactured sets which can be used in a phonograph cabinet, but thus far, no information has yet appeared which is of any help to the home builder. The mechanical details of the receiver are especially well worked out and the panel can be used with any type of cabinet phonograph now on the market.