File:Bell telephone magazine (1922) (14753540441).jpg

Identifier: belltelephonemag19amerrich (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:
ice disruption. In those areas where heavy stormspredominated, the occurrence of me-dium storms has not been indicated.However, in sections where moststorms were medium, but in whichsome heavy storms occurred, pins with black background and pins with whitebackground are to be seen inter-mingled. The method adopted in posting themap results in a closer spacing of thepins in those areas in which ice stormsare more prevalent. In those areaswhere the telephone plant was not op-erated by companies associated in theBell System, in which no open-wiretelephone plant existed, or in whichno ice storms were reported, no pinswere placed. It is interesting to ob-serve over what an extensive portionof the United States at least one icestorm was experienced during the pe-riod of the study. Data such as this map providedwere not available from any of theregular sources of meteorological in-formation, and were needed to put ona more exact and economically sound 19^0 Outwitting Open Wires Worst Foe 237
Text Appearing After Image:
■ ,^m- -^ IS.^-C^i. Fig. 7. ICE CATCHERS These racks of various sizes of wire, located at different points throughout the country, addto the information about accumulations of ice basis the determination of the type oftelephone line adequate for a givenlocality. The importance of delineat-ing these ice storm zones is evidentwhen we consider that the cost of,say, a typical 30-foot 40-wire pole lineconstructed to meet conditions to beexpected in areas where heavy icestorms occur frequently would be onethird again as much as would that ofa similar line where such storms donot occur. The N.E.S.C. Code In the National Electrical SafetyCode, drawn up under the procedureof the American Standards Associa-tion by a sectional committee underthe sponsorship of the National Bu-reau of Standards, the United Statesis divided into three different stormloading areas based on weather condi-tions, as shown in Figure 6. The es-tablishment of these areas as a guideto the wire-using companies in theirba

Note About Images