meter prover (meter pro"ver)

A registering holder, or a gas-tank of known capacity, used for testing the accuracy of gas-meters. meter-wheel (mē'tèr-hwēl), n. A drum or hollow wheel with several chambers, to which air or other gas is admitted through a tube in the axle. In use, the wheel is immersed in water above its axis, and the gas, filling each chamber succe ively, causes the chamber filled to rise and the wheel to revolve, when the gas is discharged above the level of the water by an opening. The chambers are of known capacity, and the revolutions of the wheel are recorded on dials. Such wheels are used in gas-meters, in which the pre ure of the gas flowing through the meter gives the driving power.