Robison's Manual of radio telegraphy and telephony for the use of naval electricians (1918)
Robison, S. S. (Samuel Shelburne), b. 1867, United States Naval Institute, Todd, David Wooster, Hooper, Stanford Caldwell · Annapolis, Md. : The United States Naval Institute · leaf 135
FIG. 63 BELLINl-TOSI FIG. 64 MARCONI GOV3 … FIG. 65 UMBRELLA TO SENDlNq Ht\.\]kFIG 67 auY9 ne: y Mt stone: t massieljnsulated wire 4- bare wjrei FIG. 66(Now Obsolete)
