File:Bell telephone magazine (1922) (14569974149).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

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:
■X., nm9 .W»
Text Appearing After Image:
Taking a Motion Picture at Chester to Show the Making and Applying of MortarBandage Joints to Multiple-duct Conduit GEOGRAPHY OF BELL TELEPHONE LABORATORIES than radio. Several years ago response measurements weremade on high-power loud speakers. One group of speakershad a sound-power output of 100 watts, and another group 500watts. At another time experiments to determine the flam-mability of central office wiring were made. A small fireprooftemporary building was erected for this purpose. Regulardial-office frames were used, some wired with standard cableand others with improved types of cable. Careful observa-tions were then made, under fire conditions, of relative flam-mability. In connection with these studies, tests were alsomade on the effectiveness of various types of fire-fightingequipment for use in central offices. Outside Plant Development Laboratory at Chester Many of the products used out-of-doors in the telephoneplant are of a character which renders impractable their c

Note About Images