Me′ter-wheel.
One used in connection with gas and liquid meters and air-carbureting machines. [1428] In the former, it is driven by the flow of gas whose volume it measures; and in the latter case it is usually employed to induce a flow of air through the hydrocarbon liquid, and performs the function of a blower. It has usually several chambers, and when measuring gas, is submerged above its axis in water, in the chamber wherein it rotates. The chambers in the wheel are of known capacity, and the revolutions are registered upon dials. In the gas-meter, the gas passes in at the hollow trunnion, and passes from the central pipe to each chamber in turn. As the gas fills the chamber it rises, and, when filled, its lip rises above the surface of the water and discharges its gas into the upper part of the containingcase. As the chambers of the drum pass over, they again fill with water. See gas-meter.
