Celtic Hourglass
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Owner:
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Tom*Bombadil
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Released:
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Friday, February 13, 2009
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Origin:
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Nordrhein-Westfalen, Germany
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Recently Spotted:
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Unknown Location
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going to England and Scotland
An hourglass, also known as a sandglass, sand timer, sand clock or egg timer, is a device for the measurement of time. It consists of two glass bulbs placed one above the other which are connected by a narrow tube. One of the bulbs is usually filled with fine sand which flows through the narrow tube into the bottom bulb at a given rate. Once all the sand has run to the bottom bulb, the device can be inverted in order to measure time again. The hourglass is named for the most frequently used sandglass, where the sands have a nominal running time of one hour. Factors affecting the amount of time that the hourglass measures include: the volume of sand, the size and angle of the bulbs, the width of the neck, and the type and quality of the sand. Alternatives to sand that have been used are powdered eggshell and powdered marble. Hourglasses are still in use, but typically only ornamentally or when a relatively approximate measurement of time is needed, as in egg timers for cooking or board games or in health promotion to help people know for how long they should clean their teeth. Hourglass collecting has become a niche but avid hobby for some, with elaborate or antique hourglasses commanding high prices.
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