gasometer

noun

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

   “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.”

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

2. 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 […]”