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The throbbing of the arteries as blood flows through them. The pulse matches the rate at which the heart is beating.
Device to measure equal periods of time by the motion of sand or other free-flowing, fine-grained substances through a narrow aperture between two triangular or conical glass bulbs arranged mouth to mouth; probably introduced in the early 14th century and used then especially for timekeeping on board ships. Hour-glass or minute-glass are specific examples.