g.w. schleidt stc8003-p newton gravity glass timer 3 minute purple sand 10-inch

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a sand timer is a centuries-old device that uses sand and gravity to measure time. in this ingenious g.w. schleidt design, inspired by 17th century physicist isaac newton, the sand timer is suspended in a clear liquid within a glass cylinder. when the apparatus is inverted, the sand slowly trickles
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