qasjj615
@qasjj615 Activ Acum 4 zile, 22 de ore
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How does an hourglass measure time?
The sand timer hourglass is sometimes referred to as a sand clock or a sandglass. Like other timepieces, it needs to be carefully calibrated. The hourglass maker must test the instrument and fine tune it to measure the correct length of time.
There are many factors that contribute to the ability […] Vezi
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