File:Bell telephone magazine (1922) (14733008636).jpg

Identifier: bellvol25telephonemag00amerrich (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:
ove Successful Suddenly this interesting train ofthought was turned in a new direc-tion by the bombing of Pearl Harbor,and our immediate entry into theWar. The Army would surely needoverseas communications beyond allprecedent. Overseas telephone serv-ice with enemy-held countries hadbeen suspended, leaving high-graderadio facilities and expert techniciansavailable for other purposes. Howcould these assets be employed tomeet the Armys need? In a small conference at LongLines headquarters in New York, anexecutive asked: Do you think wecould operate a voice-frequency car-rier telegraph system on a short-waveradio circuit, just as we did in theBritish long-wave emergency plan? The first responses to this questionwere discouraging. It was pointedout that short-wave signals often varyor fade a thousand-fold in strengthat intervals of only a second or so.Long waves are not afflicted by thismalady, yet the results of the long-wave tests had been only fair. Butsomeone said, Well, it wouldnt do
Text Appearing After Image:
A Long Lines overseas radio transmitter on the Atlantic coast. Employment of the Bell System's experienced civilians at such posts released Army technicians for duty elsewhere. any harm to make some tests, wouldit? So it was decided to try, beforegiving up, and within a few davs ex-perimental work on the multi-channelradio teletype system began. xA.lthough far from satisfactory,the initial tests showed great prom-ise, and stimulated further efforts.More men were assigned to the proj-ect, and the Bell Telephone Labora-tories and the Department of Opera-tion and Engineering were invited toparticipate—which they most whole-heartedly did. Ideas for improve-ment sprang from all sides. Withina short time an experimental systembetween New York and San Fran-cisco was working so well that thepower of the radio transmitter in Cal- io6 Bell Telephone Magazine SUMMER ifornia could be reduced to only 25watts—barely enough to light a smalllamp—and still good teletype copywould be received in New

Note About Images