potentiometer.

/puh-ten-shee-om-i-ter/US // pəˌtɛn ʃiˈɒm ɪ tər //UK // (pəˌtɛnʃɪˈɒmɪtə) //

电位器,电位计,电位仪

Definitions

1.
Electricity.
- ›a device for measuring electromotive force or potential difference by comparison with a known voltage.
- ›voltage divider.

Meanwhile the gravity potentiometer (gravy board) was changing its reading constantly and erratically.
The potentiometer must never be shunted around the B battery or the latter will soon run down.
In using either of these heterodyne receivers be sure to carefully adjust the B battery by means of the potentiometer.
Don't connect a potentiometer across the B battery or it will speedily run down.
Don't expect to get the best results with a gas-content detector tube without using a potentiometer.