three-minute glass
Hourglass Hour"glass`, n. An instrument for measuring time, especially the interval of an hour. It consists of a glass vessel having two compartments, from the uppermost of which a quantity of sand, water, or mercury occupies an hour in running through a small aperture unto the lower. [1913 Webster]

Note: A similar instrument measuring any other interval of time takes its name from the interval measured; as, a {half-hour glass}, a {half-minute glass}. A {three-minute glass} is sometimes called an egg-glass, from being used to time the boiling of eggs. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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