Hourglass
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Hourglass
Hourglass (pronunciation: /ˈaʊərˌɡlɑːs/) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated trickle of material from the upper bulb to the lower one.
Etymology
The term "hourglass" comes from the Old English words "hōra" and "glas". "Hōra" means "hour" and "glas" means "glass". The term was first used in the 14th century.
Related Terms
- Sandglass: Another term for an hourglass, referring to the sand that is used as the time-measuring material.
- Clepsydra: An ancient time-measuring device that uses the flow of water to measure time.
- Sundial: A device that tells the time of day by the apparent position of the Sun in the sky.
- Chronometer: A precise timekeeping device used in scientific applications and in navigation.
- Clock: A device used to measure, keep, and indicate time.
See Also
External links
- Medical encyclopedia article on Hourglass
- Wikipedia's article - Hourglass
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