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 149
nsist of two or three sections telescopedtogether, the length of the joint lieing 2 feet. Aerial cahles, dry core Avith a covering of vulcanizedindiarubber and an outer covering of ozokerited tape or astill more durable pattern of lead-covered cable, are usefulfor overhouse and under bridges. Not…
Telegraph
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
