Difference between revisions of "Hour glass"
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| − | An '''hour glass''' is | + | An '''hour glass''' is an obsolete [[time]]-keeping device. It is made up of two bulbs connected by a narrow passage, through which sand flows at a given rate. Hourglasses were probably invented in [[Alexandria]], [[Egypt]] between 200 and 300 A.D. <ref> |
| + | {{Cite book | ||
| + | | publisher = W. & R. Chambers, Ltd. | ||
| + | | isbn = | ||
| + | | pages = | ||
| + | | last = | ||
| + | | first = | ||
| + | | title = The Book of Days: A Miscellany of Popular Antiquities in Connection with the Calendar | ||
| + | | date = | ||
| + | | year = | ||
| + | }}</ref>. Though they are no longer used for the purpose of keeping time, they are sometimes used in lieu of electronic timers, for example, as egg timers. | ||
| + | |||
| + | ==Sources== | ||
| + | {{reflist}} | ||
[[category:technology]] | [[category:technology]] | ||
Revision as of 16:40, July 17, 2009
An hour glass is an obsolete time-keeping device. It is made up of two bulbs connected by a narrow passage, through which sand flows at a given rate. Hourglasses were probably invented in Alexandria, Egypt between 200 and 300 A.D. [1]. Though they are no longer used for the purpose of keeping time, they are sometimes used in lieu of electronic timers, for example, as egg timers.
Sources
- ↑ The Book of Days: A Miscellany of Popular Antiquities in Connection with the Calendar. W. & R. Chambers, Ltd..