Image from page 19 of "Bell telephone magazine" (1922)
Title: Bell telephone magazine
Contributing Library: Prelinger Library
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Text Appearing Before Image:
WARNING DISTRICT CENTER ®3 NFORMATIONCENTER OperationsBoard ^ Operotions Officers Civil Air RaidWarning Switchboard -4 CIVILIAN ACTION Other Information CentersAir FieldsInterceptor Plones in FlightAir Corps HeodqVrsOther HeodqtVsArmy, Navy, Coast GuardAnti-Aircraft Stations , To Other District Control Centers To Other WarnirjgDistrict Centers LOCAL CONTROLCENTER
Text Appearing After Image:
CIVILAfR DEFENSE Alarms Defense Organizations Civil Institutions: Hospitals, Schools,etc.Police and Fire Depts.UtilitiesRailroadsManufacturing Plants DAMAGE CONTROLRescue, Medical ond Decontominotion Services, Highway, Police and Fire Department$,Utilities Telephone Lines and Air Defense Only the upper portion of this diagram represents military activity. The lower part shows how the telephone serves Civilian Defense as well 19^2 Telephone Lines and Air Defense scheme. It has been brought intoexistence because, instead of necessi-tating a constant patrol in the air, itis an effective method of interceptionwhile conserving the air forces avail-able. 1 HIS plan of air defense was not de-vised over night. The idea of the ci-vilian ground observer system wasconceived a decade ago, and has beentried out, with the cooperation ofthe telephone companies, in succes-sive maneuvers since its inception.Early experiments were crude, buteach test brought improvements andrefinements.* Today, upon th
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