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 120
5 t … SYNCHRONOUS ROTATING SPARK GJ\P NON-SYNCHRONOUS ROTATING; SPARK QAP FIG 52 FiG. 53 AIR ^f^ FIG 54 FIG. 55 u AIR BLAST QAP PARALLEL qAP
