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The object in the image is a water gauge.
Function:
It is a measurement instrument used to indicate the level or pressure of water in a system, such as a tank, boiler, or even in mine ventilation systems.
Mechanism:
Some types, like the one suggested by "INCHES WATER GAUGE" and the visible U-tube structure, are manometers that use a liquid (often water) in a U-shaped tube to measure pressure differences or levels based on the liquid's displacement.
Application:
In contexts like mine ventilation, a water gauge is used to compute the power on the air by measuring pressure differences.
INSTRUMENTS
MINE WATER GAUGE A water gauge consists of a glass u tube partially filled with water open at both ends and is graduated in inches and tenths thereof. A water g...