ANSWERS: 2
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Because of the ancient timing of its inception, it is not known who is responsible for inventing the hourglass. However, initial use of the hourglass as a timepiece was definitively established in the first part of the 14th century in Europe.
Source:
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There's no way to know. "According to the American Institute of New York, the clepsammia or sand-glass was invented at Alexandria about 150 BC.[1]"
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