July 19, 1921 eckhardt and karcher: radio recorder 



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rent, and there results a rise in the mean plate current as shown by 

 figure 2. By proper design, conditions may be so chosen that the 

 rise in plate current occasioned by the initiation of oscillations in the 

 regenerative circuit is many times the plate current flowing just be- 



Fig. 2. Growth of current in a regenerative circuit. 



fore the oscillations set in. Regenerative circuits have been operated 

 by us in which the plate current shoots up from 2 or 3 milHamperes 

 to 50 milHamperes when by raising the grid potential a small fraction 

 of a volt the circuit is made to pass from the non-oscillatory to the 

 oscillatory state. In our recorder the rise is from approximately V* 



