File:Bell telephone magazine (1922) (14570028518).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

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Testing V/ood Preservatives, Using A Special Technique Developed at THE Summit Laboratory The Building at Pleasant Grovi . N. J., Where Tests of Cable- ^A carrier Repeaters Were Con- ^^i
Text Appearing After Image:
GEOGRAPHY OF BELL TELEPHONE LABORATORIES the effectiveness and stability of crosstalk balancing, of trans-mitting over cable pairs the power supply for auxiliary re-peaters, and of methods of stabilizing the attenuation of cablecircuits. It is sometimes practicable to use the telephone plant itselffor experimental work. For example, when the new type-J carrier telephone system was being designed, a 100-mile sec-tion of open-wire line in Kansas was re-transposed by thetelephone company and a traveling laboratory was set up in atrailer. Crosstalk and noise measurements were made at vari-ous points along the line and the data obtained were used asa basis for further modifications in the transposition design.The first of these systems was installed between Jacksonvilleand West Palm Beach well in advance of its need for commer-cial service and exhaustive tests were made on every part ofthe system. Where dust storms are common, static fromthem is an important factor in these high-frequency

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