gasometer
An apparatus used to store or measure gas or the flow of gas, particularly in a laboratory setting.
historical
I take a mercury bottle and then an old gun barrel, draw the breech end to a convenient size to cut a thread on it so as to make a tight joint; then take a lead tube and connect one end to the muzzle of the gun barrel and the other end to the gasometer.
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 […]
Where it comes from
From French gazomètre, corresponding to gaso- + -meter.
Adapted from the Wiktionary entry gasometer (CC BY-SA 4.0).