What are the five specious arithmetic of moisture, looking at wax, listening to strings and calculating sand?

It is based on the ancient timing method.

The dripping of copper pot is also called "leaky carving" or "leaky pot". That is, the water level of the copper pot is changed by the running water at the bottom of the pot or a water holding tool with a small hole near the bottom of the pot to calculate the time.

The sundial (pronounced gu), also known as "sundial", is another kind of timing instrument in ancient China.

The ancient hourglass was caused by the time of sand from one end to the other. This error is very large.

Besides, China people also make clocks and watches in other ways. For example, they calculate time by burning smoked candles with time stamps. etc