File:Bell telephone magazine (1922) (14569581817).jpg

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Description
English:

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

View Book Page: Book Viewer
About This Book: Catalog Entry
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Text Appearing Before Image:
pplication it pro-vides the means for a quick large-scale survey of geological structureof the earths surface, and therebymay provide clues for the discovery of new oil and mineral deposits. Forthis sort of work it has been com-bined with SHORAN, a radar mappingdevice, and special mapping cameras. A MAGNETIC FUZE for mines was an-other development of the Laborato-ries, and about 12,000 mines equippedwith it were dropped by airplane inshallow water in Japanese shippinglanes. The magnetic fuze was basedon the Laboratories earlier inventionof permalloy, an alloy which is re-markably sensitive to magnetism. Asa mine lay on the bottom, the perm-alloy in the fuze responded to thechange in magnetism when a shippassed within lethal range. The fuzewas so designed that it could count offand pass the first ship or several shipsin a convoy and blow up the next oneto pass. Mines equipped with thisfuze destroyed about 300,000 tonsof shipping, and many more tonswere neutralized by fear of the mines.
Text Appearing After Image:
sf,*»T«^t.w«l; How a rocket flies (left): pictures taken at the rate of 4^000 per second. Right: AFastax camera in the laboratory^ about to photograph dial telephone switching equipment which moves faster than the human eye can see 1946 Bell Laboratories Role in Victory 125

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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@N07/14569581817. 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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