...We could not produce a radio wave ofgreat enough length to pierce out through earth's insulating layer andacross the gulf to Mars...
Various 「Astounding Stories, April, 1931」
...If the cable hadever had an insulating sheatharound it the fabric had vanishedduring the centuries for the dullsilver-colored metal was now completelybare...
Hal K. Wells 「The Cavern of the Shining Ones」
...At best the insulating qualitiesof the roll would be far from perfect,yet it might serve to minimizethe effects of the cable's chargeenough to give him some chance ofescaping alive...
Hal K. Wells 「The Cavern of the Shining Ones」
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