Hourglass
Although it is only a piece of decoration or souvenir nowadays, the hourglass is the one of earliest tool to accurately keep track of time. It is probably invented in medieval Europe. Until the innovation of the mechanical clock, the hourglass was the preferred method to measure time, especially aboard ships. It is quite dependable, stable despite external disturbance such as the motion of a ship, and because it uses sand it will not freeze in cold conditions. Modern use of the hourglass includes as a timer for cooking eggs or other food and for timing many procedures of the Australian Parliament.
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