. Bell telephone magazine . onths of pro-duction time, which included 2,980 inspec-tions and 5,000 hours of simulated opera-tion. Only about one of every ten tubespassed a final, rigorous analysis by a com-mittee of Western Electric and Bell Labora-tories engineers. But meticulous selection paid off. Whenthe last tube came off the line, not a singlefailure had occurred among nearly 6,000tubes already at work in eight cables criss-crossing the seas. The tubes have already been delivered forthe last three cables to use the electron tuberepeater. Two of them will be laid this year. Armored Cable
. Bell telephone magazine . onths of pro-duction time, which included 2,980 inspec-tions and 5,000 hours of simulated opera-tion. Only about one of every ten tubespassed a final, rigorous analysis by a com-mittee of Western Electric and Bell Labora-tories engineers. But meticulous selection paid off. Whenthe last tube came off the line, not a singlefailure had occurred among nearly 6,000tubes already at work in eight cables criss-crossing the seas. The tubes have already been delivered forthe last three cables to use the electron tuberepeater. Two of them will be laid this year. Armored Cable Under Hudson ■| Two specially-made telephone cables havebeen buried in the floor of the HudsonRiver north of New York City as an additionto the Bell Systems underground cross-country cable route, designed to withstandnuclear attack and natural disaster. The cables cross near the rivers broadestpoint from the Tarrytown, area to northof Nyack, Placed in the depths by theLong Lines Department of , the 67. Lorii^ Lines man coordinates slufre operationas armored cable is laid under Hudson River. cables will help carry a growing volume oflong distance calls to and from Boston. Long distance calls are usually transmittedacross the Hudson via microwave radio sys-tems. The new underwater cables providemore secure communications channels inaccordance with the blast-proof design ofthe transcontinental underground system. Both manufacture and installation of thecables were geared toward maximum secu-rity. More than six miles of heavily armored12-tube coaxial cable were manufactured forthe project by Western Electrics Baltimoreworks. The portions of the cables that crossthe river were armored with an added layerof steel, as protection against river currents,heavy tides and passing ships. Laying of the two cables was accomplishedby specially trained crews working from twolarge barges. After the cables had beenplaced on the bed of the river in parallelpaths 300 feet apart,
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
