The potentiometer must never be shunted around the B battery or the latter will soon run down.
Don't expect to get the best results with a gas-content detector tube without using a potentiometer.
In using either of these heterodyne receivers be sure to carefully adjust the B battery by means of the potentiometer.
This was balanced by a potentiometer arrangement, so that the galvanometer spot came to zero.
By means of a potentiometer the galvanometer spot may be brought back to the original position.
Don't connect a potentiometer across the B battery or it will speedily run down.