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The Composition And Principle Of Hourglass
- Apr 19, 2018 -

It is composed of two white seats and three transparent pillars. In the middle is a two-waterdrop-shaped transparent glass cover "gourd." Its glass cover has many purple sand grains that can pass through a small hole and flow from one glass cover to another. Yes, it is an hourglass. The hourglass, also called "sand clock," is an ancient timekeeping device. Hourglasses work in much the same way as the ancient chronograph tools of ancient China. Leakage is timed based on the amount of water flowing from one pot to another, while the hourglass is based on the amount of sand leaking from one vessel to another.

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