Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 135
ial iiisiilatoi-. ¥><■■ inj.-Sinn- insulatdf. Where a line terminates and a covered l(>adin,<i-in wire isvised then an iuKuhator ol special form nn-eiilcil hy Messrs. 124 ELEMENTARY TELEGRAPHY Sinclair and Aitken is provided (see Fig. 103). It is madein two parts wliicli scre^v… … Fic. 103.—The Sinclnir-AitkiU k\,diii.n-iii insulator. with rubber insulated leadiiig-in wires ; where paper insu-lated lead-covered leading-in wires are employed anotherform of the S.A. insulator is ]n-ovided. (kipper li-ire.—Owing to its superior electrical qualitiescopper is joreferred to iron…
Telegraph
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