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 194
to line amply sufficing to reach the most distant station.The resistance may be made afterwards approximately twicethe resistance of the line. The head office can obtain abalance by the out station depressing key—^if more than oneout station take two balances ; first to the nearest and thento the… … *mr ■♦500 L,^ Fio. 156.—C.B. Wheatstone and key : theoretical connections. arrangement, which provides for key simplex or duplex;duplex Avith Wheatstone from the central office and keyAvorking from the out station ; or Wheatstone simplex fromthe out station, the central office being able to stop…
Telegraph
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
