File:Bell telephone magazine (1922) (14753640001).jpg

Identifier: belltelephonemag26amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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n may county police teletypewriter machines.Should a troop headquarters radiostation wish to enlist the aid of policeunits outside its area, a message issent over the teletypewriter networkto radio dispatchers in other cities.Here, it is broadcast by radiotele-phone to local patrol cars in the area—an example of how radio and tele-typewriter services can be effectivelyintegrated. Another large private radiotele-phone system has been engineerecirecently by the New York Telephone Literally thousands of computa-tions had to be made to determinethe most advantageous sites fortransmitters and receivers before in-stallation could begin. For the net-work in its entirety provides a totalof 73 radiotelephone land stationsand more than 250 police carsequipped with two-way sets. Eight-een of the land stations, with 250-watt transmitters, are installed in spe-cially erected brick buildings on moun-tains or hill tops. The rest, with50-watt transmitters, arc mounted on 1947-48 Arms of the Law 213
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The radiotelephone dispatching layout of the Newark, N. /., municipal police. The officer at the right is pointing to the lamps on the wall map^ each of which represents a radio-equipped patrol car and indicates its status wish to coordinate directly the activi-ties of all police cars under its juris-diction. Hilly terrain makes suchcomplete radio telephone coverageover a broad area from a singletransmitter extremely difficult. So,to enable a troop headquarters sta-tion to establish two-way communica-tion with all cars in its area, the sys-tem includes a network of land-linetelephone channels for interconnect-ing radio transmitters and receivers.Thus the path would be from troopheadquarters over the wire networkand thence out over radio facilitiesto the police cars. Return communi-cation from a mobile unit would bepicked up by the nearest receiver andfed back over the wire line to head-quarters. These wire lines are versatile, too.When not in use for broad radiocoverage, they may be u

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