CO129-464 - Public Offices - 1920 — Page 111

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107

moving

the conductor and between each layer of gutta-percha.

The dielectric shall weigh 130 lbs. per nautical mile, or within 2-1/2 par cent. thereof, but the average weight of the insulator shall not be less than that specified,

(3) The dielectric resistance of the compl et ed dore to be not less than 50ú nor more than 1,500 megohms per nautical mile after one minute's electrification when tested with 500 volts at a temperature of 78° Fahrenh sit after 24 hours' immersion in water at that temperatura, 14 days after manufacture; and the average inductive capacity pær nautical mile not to examed 0,330 miorofarad when tested either before or after serving, and the MAXÍMUR Variation in the capacity is not to exceed 5 per cent, above the average value specified.

The total weight of the core when completed to be 174-1/2 lbs, per nautical mile or within 2-1/2 per gent, thereof, but the mean weight of the whol « mu ĶE Ć be at least equal to that specified.

The core to be manufactured in one length without

Joint.

(4) The insulated core to ba sarved with one layer of prepared tape, a layer of brass taps 4 mils thisk to be laid on, and then a layer of taps sonk ed in exokerite; all to be laid on spirally in alternate directions with sufficient overlap, the whole to be jone in an approved manner.

(5) The two cores thus insulated to be wormed

together and to be served with best tanned jute to

a suitable thickness to resulve the sheathing

her einander specified.

Sheathing