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unusual facts about hour glass



Canadian Pavilion

Open to the sky, its four inner sloping walls featured giant sculptures of a sun dial, hour glass, compass and Kyogen and Haida masks.


see also

Game clock

There are five main types of Time Controls: (1) Fischer (invented by Bobby Fischer), (2) Bronstein (invented by David Bronstein), (3) Simple Delay, (4) Overtime Penalty and (5) Hour Glass.