gasometer

An apparatus used to store or measure gas or the flow of gas, particularly in a laboratory setting.

The collected air was metered through a gasometer, and the composition of every gas sample was analyzed in duplicate […]

A large tank or reservoir for storing gas; a gasholder.

The attack on the gasworks was probably the most risky, as none of the rebels had any idea of just what kind of blast an exploding gasometer might produce […]