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Pendulum Clocks

In 1656, Christiaan Huygens, a Dutch scientist, made the first pendulum clock, regulated by a mechanism with a “natural” period of oscillation. Although Galileo Galilei, sometimes…

Sundials

Source: National Institute of Standards and Technology Physics Laboratory Not until somewhat recently (that is, in terms of human history) did people find a need for knowing the time of day. A…

The Devil's Dictionary: Clock

by Ambrose Bierce CLIO CLOSE-FISTED CLOCK -n. A machine of great moral value to man, allaying his concern for the future by reminding him what a lot of time remains to him. A …

Brewer's: Alibi Clock

(An), 1887. A clock which strikes one hour, while the hands point to a different time, the real time being neither one nor the other. Source: Dictionary of Phrase and Fable, E. Cobham Bre…

Clocks

Find information on a variety of clocks including on water, pendulum, quartz, mechanical, and sundials. SundialsWater ClocksAccurate Mechanical ClocksCalendarsCalendar & HolidaysSeasons,…

Quartz Clocks

The Shortt clock was replaced as the standard by quartz crystal clocks in the 1930s and 1940s. Quartz clock operation is based on a property of quartz crystals. If you apply an electric field…

Sara Teasdale: Eight O'Clock

Eight O'ClockSupper comes at five o'clock, At six, the evening star, My lover comes at eight o'clock — But eight o'clock is far.How could I bear my pain all day Unless I watched to see The …

Brewer's: Hand

A measure of length = four inches. Horses are measured up the fore leg to the shoulder, and are called 14, 15, 16 (as it may be), hands high. i. Hand (A). A symbol of fortitude in Egypt, of…

Water Clocks

Source: National Institute of Standards and Technology Physics Laboratory Water clocks were among the earliest timekeepers that didn't depend on the observation of celestial bodies. One of the…