San Francisco : Architect and Engineer, Inc · leaf 39
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… … TELETYPEWRITER INSTALLATION FOR INTERCEPTOR COMMAND—Duplicating telephonecircuits to a considerable extent, teletypewriters are used for communication with otherpoints on routine matters or when messages of record are desired—as well as providingalternate routes in case of need ARCHITECT AND…
Architecture · Building
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