When was the first accurate clock designed? , in 1657 , in 1637 , in 1700, When were shadow clocks first used?, 3000 years ago , 4000 years ago, 2000 year ago, When were mechanical clocks made?, in the 13th century, in the 15th century, in the 14th century, What kind of clocks were used in ancient Egypt?, hourglasses , water clocks, When were sand glasses used?, in the Middle Ages , after 1700, Where were the first wristwatches made?, in England and Germany , in France and Switzerland.

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