American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 655
RUBBER INSULATOR. A rubber insulator in which an iron hook is inserted, as snown in Ficr. 4x4, is usett 542 AMERICAN TELEGRAPHY. extensively on the underside of cross-arms, in cities, especially on house-top fixtures.TEEE INSULATOR.—When from any cause whatever it is found impracticable topass… … In isolated cases, where the owner will not permit the placing of insulators ontrees to ward off the wires from the trunk or boughs, a tube of vulcanized rubberplaced over the wire has been found of much utility. An insulator designed for attachment to trees is shown in Fig. 415. It may befixed at…
Telegraph
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