Casson, Herbert Newton, 1869- · Chicago, A.C. McClurg & Co. · leaf 166
ad deviseda machine that crumpled the paper around thewire, instead of winding it tightly. This was thefinishing touch. For a time these paper-woundcables were soaked in oil, but in 1890 EngineerF. A. Pickernell dared to trust to the tightnessof the lead sheathing, and laid a dry corecable, the… … BRdADWAV AND .lOUX STHERT, NEW VORK. AS IT APPEARSWITHOUT OVERHEAD \VHiES THE HISTORY OF THE TELEPHONE What Barrett had done was soon made clear.By wrapping the wire with loose paper, he hadin reality cushioned it with air, which is the bestpossible insulator. Not the paper, but the airin the…
Telephone
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