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Webster's Dictionary (1865)

Hȳ'dro-stăt, n.

noun

n. A contrivance or apparatus to prevent the explosion of steam-boilers. Simmonds.

An illustration of a hydrostatic balance with two pans suspended from a beam on a central stand.
Hydrostatic Balance.
An engraved illustration of a hydrostatic press with a horizontal shaft and suspended components.
Hydrostatic Press. — Fig. 2.