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Gas-om′e-ter.

The term is applied in England to a large vertical cylinder, closed above, and with its lower edge immersed in a water-tank, and used for holding gas. Such a vessel is more appropriately called a gas-holder (which see). The term gasometer probably arose from the fact that the holder is of known capacity, and as it rises affords so ready a means of estimating the quantity contained, thus constituting a meter. It is usual now to provide a meter in gas-works, whose duty it is to measure the gas on its way to the holder.

From gasometer has arisen the term airometer, when a vessel of similar construction contains atmospheric air. This is used in one form of blower, in ventilating-machines, in aspirators, machines for carbureting air, and for other purposes. See airholder.

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