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Function of Hour Glass Clock?
Describe briefly the function,how it operated and who invented it?
Function:
"An hourglass (sandglass, sand timer, sand clock, egg timer) measures the passage of a few minutes or an hour of time. It has two connected vertical glass bulbs allowing a regulated trickle of material from the top to the bottom. Once the top bulb is empty, it can be inverted to begin timing again. The name hourglass comes from historically common hour timing. Factors affecting the time measured include the amount of sand, the bulb size, the neck width, and the sand quality"
Who invented it:
"The origin of the hourglass is unclear, no early source being known for the claim that the creator of the first sand clock was an 8th-century monk named Luitprand, who served at the cathedral in Chartes, France. It was not until the 14th century that the hourglass was seen commonly, the earliest firm evidence being a depiction in the 1338 fresco Allegory of Good Government by Ambrogio Lorenzetti. Unlike its predecessor the clepsydra, or water clock, which may have been invented in ancient Egypt, the hourglass is believed to have originated in medieval Europe. This theory is based on the fact that the first written records of it were mostly from logbooks of European ships. Written records from the same period mention the hourglass, and it appears in lists of ships stores."
All the above is from Wikipedia.
http://en.wikipedia.org/wiki/Hourglass
How it operated:
If all the sand was in the bottom of the hourglass , it is ready for use.
Pick it up and turn it upside down on the table.
The sand slowly trickles from the upper glass bulb into the lower glass bulb.
At the end of an hour, all of the sand will have trickled into the lower glass bulb.
Different time spans are available like 3 minutes, 10 minutes 30 minutes, etc.
http://www.tkyoung.com/history.html
Here is a better explanition than Wickipedias for How does an hourglass measure time?
http://www.loc.gov/rr/scitech/mysteries/hourglass.html
Ben
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