File:Bell telephone magazine (1922) (14568552499).jpg

Identifier: belltelephonemag00vol2930amerrich (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
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
jacketing lead cables with alayer of the plastic for protectionagainst corrosion in some under-ground environments; application ofa layer over the core and under theouter lead sheath to provide light-ning protection for cables to be bur- winding around each other. Thenew method has already been usedin the field, and has been found torequire much less effort than previousmethods. Pre-lashing equipment has not sofar been designed to handle the larg-est sizes of cables, but the present pre-lashercan take care of at least 75 per-cent of all aerial cable installations. Other improvements in cable con-struction are achieved by new typesof cable terminals having electricalprotection built into the same blockswhich contain the terminal bindingposts, and a new type of mechanicalsplice closure at present under devel-opment. The latter promises to sim-plify the splice-covering operationand to give ready access to workingsplices in the plant. 1951-52 Post-War Achievements of Bell Laboratories 135
Text Appearing After Image:
Science The Laboratories ex-ists for the purpose ofapplying the best in sci-ence and technology tothe improvement ofcommunications, and allof its activities ulti-mately have that endin view. An impor-tant part of the job isexploring the frontiersof knowledge for newideas, new materials,and a better under-standing of the oldones. In this exploration,we not only learn muchfrom the work of oth-ers; from time to timewe also contribute sig-nificantly to the ad-vancement of science. There have been several important A member of the Laboratories pre-instances of this kind in recent years sented an important paper at thiswhich deserve special mention. meeting, and other Laboratories peo- One is Information Theory, which pie have made valuable contributionsbegan as a mathematical and philo- in this field. sophical study of the useful content Semi-conductors—that is, mate- of the messages we transmit, and of rials with properties intermediate be-the power and band width required tween metals

Note About Images