. Bell telephone magazine . sable indetecting the approach of aircraftfrom the sea and in locating airplanesin the air. Over land, there is a vast system of civilian observation postswhich swiftly report any planes, overthe existing network of commercialtelephone lines, to Army filter cen-ters. There the telephoned reportsare evaluated, and the filtered re-ports are passed on to informationcenters, where the course of approach-ing aircraft is plotted, much as ayachtsman lays out on a navigationchart the course for his days run.The Control Officer, from the infor-mation thus visually before him

GLIX-115-2CRX4RR

. Bell telephone magazine . sable indetecting the approach of aircraftfrom the sea and in locating airplanesin the air. Over land, there is a vast system of civilian observation postswhich swiftly report any planes, overthe existing network of commercialtelephone lines, to Army filter cen-ters. There the telephoned reportsare evaluated, and the filtered re-ports are passed on to informationcenters, where the course of approach-ing aircraft is plotted, much as ayachtsman lays out on a navigationchart the course for his days run.The Control Officer, from the infor-mation thus visually before him
A képet csak az alábbi országokban használhatja fel:
Magyarország
Kollekció

GLIX Prime

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Fotós / Szerző

Reading Room 2020

Leírás

. Bell telephone magazine . sable indetecting the approach of aircraftfrom the sea and in locating airplanesin the air. Over land, there is a vast system of civilian observation postswhich swiftly report any planes, overthe existing network of commercialtelephone lines, to Army filter cen-ters. There the telephoned reportsare evaluated, and the filtered re-ports are passed on to informationcenters, where the course of approach-ing aircraft is plotted, much as ayachtsman lays out on a navigationchart the course for his days run.The Control Officer, from the infor-mation thus visually before him

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