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Radio Broadcast
FIG.
batteries due to differences in inter-connection in the sets. These nine points would be: Antenna 90 45 -B +A -A +C -C Ground An investigation shows that a six-pole switch can be made to do the work, because the 90 volt, the 45 volt, and the -C are all insulated in any receiver. These three points can therefore be omitted
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from the switch and terminals can be provided for them to which all the sets may be permanently connected as indicated on the instruction card. The switch will then carry:
Antenna -B +A -A +C Ground This arrangement has the further decided advantage that terminals can be provided for various B and C battery voltages and the sets under test can be connected directly to these terminals. For example, terminals can be provided for 22, 45, 90 and 135 volts B battery and for 45 and 9 volts C battery. Inasmuch as opening the switch disconnects the -B and the +C, and disconnects the A battery entirely, from all sets, there is no possibility of a short circuit, due to differences in inter-connections.
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EXCLUSIVELY IN RADIO BROADCAST
MUCH interest has recently been aroused by the announcement that photographs have been successfully transmitted across the Atlantic, and from point to point in this country by radio. As everyone realizes, the successful transmission of photographs means that one could send practically as well complete printed pages. Signatures to valuable documents could be exchanged, as could photographs of the documents, at great distances. The other possible applications of this new branch of radio are pretty well known. RADIO BROADCAST has arranged to print a series of articles describing a method of radio transmission which has never yet been published. Experiments have been in progress for more than two years, along lines totally different from those of the Jenkins system and the Ranger system, of the Radio Corporation. These articles will contain some very startling revelations from the point of view of radio photograph transmission. There is no announce' ment we have made in many months which should so interest the reader who prides himself on following the latest developments in the field.