Publication: Journal of the Telegraph
New York, NY, United States
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.
Test of the resistance of the wires in the Second District, Southern Division. Weather clear and dry.
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:
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: