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 196
A - binOnc posts.C - variablC capocitt. D- OrNiMOMLTCR. L- INOUTANa. P - POINTER. T - SWITCH. L - LONG WAVt LENGTHS s - ShORT WAVE LENGTHS PiQ. 109. (figs. 109 and 110) are early tj^es, but differ only in details from thosenow supplied. measur:ements of wave lengths. 227. Fig. 109 shows the Pierce…