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 159
lly gives more stable oscil-lations than the ultra-Audion connection. Considerable amplification ofspark signals without the loss of musical note may be obtained by closingthe back coupling to a point not quite close enough to produce oscillations. VARIABLE CONDENSERS. In fig. 92f is shown the type… … Fig. 92f.—Variable Condenser. occupy positions between the plates of the fixed set. The capacity is variedby the relative position of the semicircular plates. The condenser shownis manufactured by the De Forest Eadio Telephone and Telegraph Co. forgeneral radio work. MANUAL OF RADIO TELEGRAPHY AND…
