Newton's Gravity Glass - 3 Minute Purple Sand
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Description & Details
Fascinating and elegant, this beautiful hand-blown glass sand timer features double action powered by gravity. When you flip the Newton's Gravity Glass over, the hourglass within the liquid-filled glass cylinder moves upward as the sand within it falls. The sand takes approximately 3 minutes to flow to the bottom of the hourglass. This is an awesome desk accessory that will entertain you and your co-workers as you try to figure out how it does that double gravity thing!
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