Identifier: belltelephonemag11amerrich (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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Because of the nature of thismaterial, it would be particularly objectionable in a duct line,due to its tendency to increase the friction on a cable beingpulled into the duct. The mortar bandage joint without thepaper insert, while superior to the other types mentioned, al-lowed a little leakage in a few of the joints; whereas the four-duct sections, joined with mortar bandages including paper in-serts, were practically waterproof. (See Figures 7 and 8, fac-ing page 221, and Figure 9, facing this page.) The results of these experiments with the mortar bandageswere so favorable that it was decided to recommend them for ageneral field trial throughout the Bell System. To adapt theiruse to field practice, however, it was necessary first to work outthe technique of handling the various steps in the process ofmaking and applying bandages. Cheesecloth, paper and tape,of the kinds found most suitable, were made available, cut tosize for conduits of different dimensions; and arrangements 224
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