File:Bell telephone magazine (1922) (14776331893).jpg

Identifier: bellvol24telephonemag00amerrich (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: BayNet

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undertaking the development of aradar equipment to meet specified per-formance requirements. The West-ern Electric Company entered intoa contract with the Navy for the BellLaboratories development of suchan equipment for ship search and lo- lengths in the range from 60 to 40centimeters. The equipment devel-oped under the contract was demon-strated to the Navy at the AtlanticHighlands laboratory during Decem-ber 1940. These tests indicated the superior-ity of the 40-centimeter wave length, 230 Bell Telephone Magazine WINTER and It was adopted for the firstequipments to be standardized. Soonafter the conclusion of these teststhe Navy authorized the deslgn-for-productlon for fleet use of two equip-ments which later were coded Mark3 and Mark 4. with sufficient accuracy to control gunfire. These were probably the firstradar equipments anywhere which de-livered complete fire-control data ofsufficient accuracy for use In battle. The urgency was so great thatWestern Electric was authorized to
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Anienna ot the pioneering Mark 4 anti-aircraft set, in-stalled on the battleship Tennessee The Mark 3 was for use onlyagainst surface targets, such as shipsor submarines, as It could only tracktargets In the horizontal plane. TheMark 4 was for use against either sur-face targets or planes in flight. Bothradars delivered complete fire-controldata—range and angular position— proceed with manufacture with allpossible speed. As soon as the de-sign of an element of the equipmentwas completed. Western placed It inmanufacture. In that way produc-tion began within a few months ofcompletion of design. The Labora-tories made performance tests on Its 1945-46 Radar and Bell Laboratories 231 first Mark 3 design model in July of 1941, and Western delivered the firstproduction model in October. Testswere made on the first Mark 4 de-sign model in August, and Westernsfirst delivery was in December. Both equipments were in produc-tion and some had been installed onNavy vessels before Pearl Harborwa

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