San Francisco : Architect and Engineer, Inc · leaf 39
MORE TELEPHONE EQUIPMENT—Since an InterceptorCommands operations are executed in terms of seconds,coordination of activities by telephone is of primary im-portance APRIL, 1942 33 … AIR RAID WARNING SWITCHBOARD—Here the C. A. R. W. officer at each Army Informa-tion Center notifies designated civilian district warning centers of the approach of enemyplanes. Note that there is a group of four jacks for each warning center: three to reportdiffering degrees of danger, and the…
Architecture · Building
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