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10" 60 Minute Sand Silver Mercury Glass Hourglass Timer Jade Green

$34.19 $27.97
(You save $6.22)
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Product Description

This beautiful mercury glass sand timer lasts 60 minutes. Hourglasses were the first dependable, reusable and reasonably accurate measure of time. The rate of flow of the sand is independent of the depth in the upper reservoir, and the instrument will not freeze. It is available in 8 different colors of sand, please see our store.

The hourglasses are freestanding. The top and bottom are both flat so it can be used without a stand.

Hourglasses are said to have been invented at Alexandria about the middle of the third century, where they were sometimes carried around just as people carry watches today. It is speculated that it was in use in the 11th century, where it would have complemented the magnetic compass as an aid to navigation. Recorded evidence of their existence is found no earlier than the 14th century, the earliest being an hourglass appearing in the 1338 fresco Allegory of Good Government by Ambrogio Lorenzetti.

Measurements: 10" H; lasts 60 minutes. Accurate within 1 minute.