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 21
Fig. 11a.—Current in A-B Rising. B D Fig. 11b.—Current in A-B Falling. When the current in A B is falling, the magnetic lines of force arecontracting, and cutting C D in the direction from right to left, thedirection of momentary current in C D being shown in fig. lib. Thesemomentary currents or…
