The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 364
Fi^ ft27.—Terminating on J BoltWooden Arm … Fig. 328 The Langdon Insulator, Fig. 328, is sometimes used forterminating wires which cross railways, etc. It has threegrooves, a long and strong bolt with a broad flange, and thegrooves are low down. It is not so good as the J bolt andS.I. insulator for strength. The Bennett Insulator (Fig.…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
