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 34
rent. 36. It only remains now to make C D produce the magnetic fieldin which it revolves, and we can dispense entirely with the primarybattery in A B. This can be done as follows: In fig. 20, instead of having eachend of C D connected to a ring ofconducting material, as in fig. 19,one ring is… … 30 MANUAL OF RADIO TELEGRAPHY AND TELEPHONY. through the split ring with that half of C D in which the current is flow-ing to the front and the other end to that half in which the current isflowing to the rear. This arrangement makes the current in E F alwaysflow in the same direction. It rises and…
