File:Bell telephone magazine (1922) (14570220747).jpg

Identifier: belltelephonemag18amerrich (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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Co-axial Conductors Entering the Test House at Phoi.mwii.i.k. Hi.re Were Conducted the Fn<ST Tests of This Structure as a Medium for Long-distance Transmission of a Broad Band of Frequencies geography of bell telephone laboratories Chemical Laboratory at Summit For nearly ten years certain groups of the Chemical Labora-tories have occupied a three-story building at Summit, NewJersey. Here studies are made on non-rubber insulation,ceramics, dielectric materials, wood preservation, and certainelectro-chemical problems. The rottii of wood is caused ex-clusively by fungi which feed on it. To retard decay the woodis impregnated with fungicides—creosotes, for example. Thetoxicity of fungicides is studied at the Summit laboratory bycultivating fungi in bottles and determining the effects ofdifferent fungicides on them. Cable sheath is one of the largest single uses of metallic lead,and the Bell System alone has about 180,000 miles of leadcable, of which about 40 per cent is underground.

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