However, the most accurate clocks available to these early navigators were water clocks and sand clocks, such as hourglass.
2.
An imaginary sand clock and a water clock were used by the poet to depict time in " Tvamevaham ".
3.
Zeev Schiff, the military analyst for the newspaper Haaretz, wrote that a " sand clock " began to run from the moment the operation was started in the form of international and, eventually, domestic resistance.
4.
:Other potential timekeeping devices would include a water clock, sand clock, mechanical timer, rolling ball clock ( unfortunately our article is a mess ), candle clock ( probably not allowed even if you could get the right accuracy ), a steam clock ( good luck getting that one by the judges ), or anything else that behaves reproducibly ( one such repurposed timekeeping device would be a mechanical metronome ).
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