ANSWERS: 1
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The first hourglass was used in the early 1300's. The first evidence of the hourglass is a fresco by Ambrosio Lorenzetti, painted in 1338 in Italy. Claims that the Greeks were using hourglasses before 800 A.D were discredited by archeology.
Source:
University of Houston College of Engineering: The Hourglass
The Hourglass Connection: Brief History
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