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 154
ine boring worm.The cable is th(>n sheathed with sixteen tarred galvanizediron wires and given a final covering of two layers of yarnwdiich has been soaked in a mixture of pitch, bitumen andresinous oil. The shore ends are more strongly armoiiredby a number of external steel wires. A short… … Fio. 121.—Section of a 4-conductor submarine cable. was tried to the Islelavc since been laid 144 ELEMENTARY TELEGRAPHY all-British Pacific cable is perhaps the most interesting,and the greatest length yet laid in one piece occurs in onepart of this cable, the section from Fanning Island…
Telegraph
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