[Trade Journal]
Publication: Journal of the Telegraph
New York, NY, United States
vol. 6, no. 2, p. 19, col. 1-2
INSULATOR TESTS.
In a test of glass insulators of the Compromise pattern, where the tie wire is attached to the center of the insulator, after one year's exposure and during a heavy rain, the resistance per insulator was found to be 4,030,000 ohms; and during a heavy fog 11,000,000 ohms.
In a test of glass insulators of the new Western Union pattern, after an exposure of one month, tested during a thirty-six hours' rain, the resistance per insulator was found to be 49 megohms.
In a test of the Pond insulator, under the same circumstances, and with a similar exposure, the resistance per insulator was found to he 850 megohms.
A test of the same glass insulators, after a fortyeight hours rain, showed a resistance of 30 megohms per insulator, and Pond's insulator, under the same circumstances, gave 525 megohms per insulator.
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Test of the resistance of the wires in the Second District, Southern Division. Weather clear and dry.
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Mean mileage resistance, 628 miles No. 8 Galvanized (American), 14.11 Ohms.
Mean mileage resistance, 402 miles No. 8 Galvanized (English), 17.32 Ohms.
Mean mileage resistance, 404 miles No. 8 Plain (American), 16.90 Ohms.
Mean mileage resistance, 1,434 miles No. 8 wire, 15.80 Ohms.
Mean mileage resistance, 657 miles No. 9 Plain wire, 21.23 Ohms.
Insulation test of lines in the Second District, Southern Division. Weather rainy:
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Insulation and conductivity tests of wires between Pittsburg and Altoona. The insulation tests were made during a rain, which continued for twentyfour hours. The tests for conductivity were made in clear, cool weather, when no escape was detected:
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