Tests of Fluid Insulators

ENGLISH NOTES.

LONDON, Feb. 15, 1888.

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Fluid Insulators.

You have already published the report upon the tests of the Oerlikon plant for the transmission of power from Kriegstetten to Solothurn, and you probably noted the fact that Johnson & Phillips' fluid insulators were employed for the overhead line. The E. M. F. during some of the tests exceeded 2,000 volts.

I have just seen a letter from Prof. Weber to Messrs. Johnson & Phillips, in which he writes as follows: "I made a most careful research on the efficiency of your insulators; the result is, it is nearly impossible to find any loss of current over a line of eight kilometres, and the diminution of potential over the line is only due to the resistance and not to a defect of insulation, or in other words, your insulators are perfect." It would be difficult to exaggerate the importance of this testimonial as regards the future of the transmission of power tor long distances, in which it is evident that the perfection of the insulation is an absolutely essential requirement. I do not know whether these fluid insulators are much employed in America, but in this country they are rapidly coming into extended use in all cases where high insulation is required.

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