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
TO SEMPlNCi HELIX FIG. 68 FIG. 69 (Now Obsolete) (Now Obsolete) -TO SENPlNGv HELIXFIG. 70 I TO SENDlNt^ HELIXFIG. 71 … Fig. 71a.—Latest Marconi High Power Antenna. MANUAL OF RADIO TELEGRAPHY AND TELEPHONY. 131 Marconi found that a long flat-top aerial, like fig. 64 and fig. 71a, sendsmore strongly in the direction away from the free end of the aerial andreceives more strongly from the direction in which it sends…
