Identifier: belltelephonemag22amerrich (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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d the varyingdensity of the air, e, slows down theprojectile more or less; while the direc-tion and the velocity of the wind, f,either retards or pushes the shell aheador to one side. To add to the complica-tions of the problem, the difi^erence inthe location of the tracker and the gun,g, must also be taken into account inmaking the computations. 1943-44 Electric Brain 259 munlcations background, its tele-phone know-how, had appliedthese attributes to the problems ofanti-aircraft fire control and had de-veloped the M9 electrical gun direc-tor, which according to Major Gen-eral L. H. Campbell, Jr., Chief ofOrdnance . . . is one of the great-est advances in the art of fire controlmade during the war. Laboratories School for War Train-ing: Almost exactly three years agotoday final approval was given toproceed with the development ofthe electrical director now per-forming an important part in thecontrol of anti-aircraft guns.Within about a year from thattime, a model of the first director
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One of the four anti-aircraft guns of the battery which at the Laboratories demon-stration was aimed by the electrical gun director. Directly behind it is thetracker and at the right is the computer. In the right background appearssome of the Laboratories* Murray Hill development The demonstration was given withthe approval and cooperation of theU. S. Army Ordnance Departmentand was occasioned by the third an-niversary of the beginning of de-velopment work on the electricaldirector, as explained in the intro-ductory remarks by R. Karl Hona-man. Director of Bell Telephone had been sent to the Army for test.Within another year the tests hadbeen completed and the WesternElectric Company was providedwith the data necessary to beginproduction. Today, three yearslater, many of these instrumentsare in the hands of our armedforces. 26o Bell Telephone Magazine WINTER Thus the Murray Hill grounds be-came a typical anti-aircraft position.Four 90-mm. guns formed a quad-rangle. Dr. Harvey Fletcher

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