Baille, Jean Baptiste Alexandre, b. 1841, Armstrong, John W., ed · New York, Scribner, Armstrong, and co. · leaf 115
en feet, twenty-two feet, and thirty-two feet, their thick-ness necessarily de-pending upon theirheight. When thesupports are placedin the earth in goodcondition they lasta long time. Cupsof porcelain or glassare set at the tops ofthe posts, for thepurpose of sustain-ing the wires, and in-sulating… … Bell-shaped Insulators. CONSTRUCTION OF LINES. 95 rings when the wire, dragging its support, might riskthe breaking of the hook. The electric wire is made of galvanized iron, thethickness of which varies from .31 to .34 inch. Onemile of this wire weighs about 373 pounds. It isby its weight that its…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher04nati-12-6.webp)
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-456-282.webp)
