7" BLACK Sand Glass Hourglass Sandglass Timer Modern

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. This is a 60 minute timer. It is available in both black sand and white sand. It comes with a plush gift box. Shipping is free in the lower 48.

Measurements: 7" tall, 4" wide

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.[2] 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.

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