Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 25
|!SOUNDEJ, MAIN LIKE Fig. 15. Circuits. … MAIN- BAT, OBOUND fi MAIN^UAL OF TELEGEAPIIY. 23 Name the two classes of telegraijliic circuits —Main and local. Define the main line — The main circuit extendstlie entire length of the line, of which the wirebetween offices forms a part. What part of a main line does the earth form —It is nsed…
Telegraph
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
