water gauge

any device for indicating the height of water in a reservoir, tank, boiler, or other vessel.

Origin of water gauge

First recorded in 1700–10

No fitting of a boiler is more important than the water-gauge, which shows the level at which the water stands.

How it Works |Archibald Williams
A third wave was noticed within an hour, raising the water-gauge over a foot.

The Outlet |Andy Adams
A water-gauge in plain sight keeps the driver informed at all times as to the amount of water in the boiler.

Stories of Inventors |Russell Doubleday
Will Garvie consulted the water-gauge for a moment and then opened the iron door of the furnace in order to throw in more coal.

The Iron Horse |R.M. Ballantyne

“We are going to have a bad night of it,” observed John Marrot as his mate examined the water-gauge.

The Iron Horse |R.M. Ballantyne

water gauge

an instrument that indicates the presence or the quantity of water in a tank, reservoir, or boiler feed Also called: water glass