. Bell telephone magazine . useof the broad band of frequencies thatmust be handled, this must be donemore frequently and with greater pre-cision. For the most part, repeatersare at unattended locations, in man-holes or small outdoor huts, and greatcare is taken to avoid interruption ofservice. For added safety, a spare pipe isusually held in readiness, and at suit-able intervals along the line the re-peaters are arranged to transfer theload instantly from the working lineto the spare if serious trouble devel-ops on any section of the line. Thepersonnel at attended stations receivealarms when
. Bell telephone magazine . useof the broad band of frequencies thatmust be handled, this must be donemore frequently and with greater pre-cision. For the most part, repeatersare at unattended locations, in man-holes or small outdoor huts, and greatcare is taken to avoid interruption ofservice. For added safety, a spare pipe isusually held in readiness, and at suit-able intervals along the line the re-peaters are arranged to transfer theload instantly from the working lineto the spare if serious trouble devel-ops on any section of the line. Thepersonnel at attended stations receivealarms when difficulties arise any-where on the section of the line whichis in their care, together with exactinformation as to the nature of manyof them. Means are also providedfor transferring the load to the spareconductor by remote control, adjust-ing the power level, or carrying outmany other necessary operations. There are now over 50,000 milesof coaxial pipes in the Bell System i95i Post-War Achievements of Bell Laboratories 169. Amplifiers for the Key West-Havana submarine telephone cable are built in such formthat they can be enclosed in slightly enlarged sections of the cable itself. In this picturea Laboratories engineer and two assistants are removing a finished amplifier from the assembly fixture plant. They represent an importantaddition to the nations facilities fortelephone and television service, andtheir potential contribution, throughconversion to the new system whichis under development, will be evengreater. Deep-Sea Amplifiers in aSubmarine Cable The LAST SPLICE in new twin cablesbetween Key West and Havana wasmade in April 1950, following a de-velopment program begun about 20years ago, and established anothermilestone in communication.* The cables are about 140 miles * See New Voiceways Under the GulfStream, Magazine, Summer 1950. long. Each is equipped with repeat-ers at 40-mile intervals, and is usedfor transmission in one direction they provide 24 hig
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