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Updated: May 24, 2025
The smallest size coils cost about $1.50 apiece and the mounting costs about $6 or $7 each. The A Battery Potentiometer. This device is simply a resistance like the rheostat described in connection with the preceding vacuum tube receiving sets but it is wound to 200 or 300 ohms resistance as against 1-1/2 to 6 ohms of the rheostat. It is, however, used as well as the rheostat.
In using either of these heterodyne receivers be sure to carefully adjust the B battery by means of the potentiometer. Wireless Headphones. A telephone receiver for a wireless receiving set is made exactly on the same principle as an ordinary Bell telephone receiver.
Shunt the potentiometer around the A battery and connect the sliding contact with the or zinc pole of the B battery and the + or carbon pole with one terminal of the headphone; connect the other terminal to one of the posts of the variometer and the other post of the variometer to the plate of the detector. Finally shunt a .001 mfd. fixed condenser around the headphones.
Simultaneously there was added from the potentiometer, already set to the exact figure given by the computer, the plus-equilibrium power which would not be changed throughout the journey if the ideal acceleration curve were to be registered upon the recorders and the immense mass of the cruiser of the void wafted vertically upward at a low and constant velocity.
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