File:Bell telephone magazine (1922) (14732984836).jpg

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Identifier: bellvol25telephonemag00amerrich (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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52 Bell Telephone Magazine SPRING
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A ROCKET starts its journey, its accuracy increased by the spin imparted in launching within an outer stationary tube at-tached to a tripod. Provisions weremade for arming the assembly, anda motor was provided to rotate thelaunching tube at speeds of 900,1,800, and 2,700 rpm. With this arrangement, an exten-sive series of tests was carried out todetermine the effect of spin on dis-persion. It was found that a con-siderable decrease in dispersion wasobtained with very moderate spins,and that the speed was not critical—essentially the same improvement wasobtained over a wide range. With-out spin, the dispersion for the stand-ardized rocket was 39 mils: that is,the rocket would deviate 39 feet in1000 feet of travel, while with spinsof 800, 1,400 and 2,400 rpm thedispersion was reduced to 13, 11, and9 mils, respectively. The improvement in dispersion ob-tained in these and other tests re-sulted in intensive research programs both here and abroad to reduce dis-persions by giving the rock

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27 July 2014

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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14732984836. It was reviewed on 17 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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