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Webster's Dictionary (1865)

Wā'ter-gauge, n.

noun

n. [Written also wa-ter-gage.]

  1. An instrument for measuring or ascertaining the depth or quantity of water, as in the boiler of a steam-engine. See GAUGE.
  2. A wall to restrain or hold back water. Craig.
A vertical mechanical linkage with two hand-operated valves mounted beside a hatched support and a fluid-level indicator.