One in 2019 Well-reviewed ancient costume TV dramas mainly talk about twelve hours, that is, things that happen within twenty-four hours, so in the play you can often see various pictures about timing and timekeeping. All kinds of timing units, such as a moment, a stick of incense, a cup of tea, a few days and so on.
The most commonly used timekeeping instruments in ancient times are mainly these types. The equipment that uses the shadow cast by the sun to measure time is the sundial that we all know.
There is also a method of using fire to burn incense and timing. The dragon boat incense leak that appeared in the film and television drama is this method. timekeeping.
In addition to these two timing methods, there is also the use of how much water flows to time. This is the leaky engraving or the leaky pot. In fact, this timing instrument is very similar to the hourglass we are still using now.

Hourglass is a glass ball filled with sand that flows from one end to the other to tell time. The measuring equipment generally contains a certain amount of fine sand inside, so that the fine sand in one glass ball slowly flows into another glass ball through a narrow pipe, and the time required to measure the time, it is also possible to turn the hourglass upside down. Continue to measure the time, the amount of sand in the hourglass and the size of the channel determine the length of the measurement time.

hourglass< /a>Development history
It is said that the hourglass first appeared in the 12th century and was used for sailing at night, because it can be calculated by querying the sun during the day Time, and at night can only be calculated by the hourglass.
The earliest record of an hourglass was found in a fresco in Italy in 1338.
By the 15th century, hourglasses began to be widely used, and there were already hourglasses on the market, mainly used in marine navigation, industry and cooking.

In the Yuan Dynasty in 1360, our country also made a device that used quicksand to time time. It relies on quicksand to drive the gear to rotate to show the time on the dial. The timing will be inaccurate.

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Hourglass is also used to time the time in the history of our country, but it has been used for the longest time and has the widest application scale The timing device is still missing, it is the same as hourglassThere are similarities, all of which are recorded according to the way the object falls at a uniform speed.
The earliest leaky carving is a container that looks like a barrel. The ancients used it to calculate the time. People poured water into it and calculated the time according to how much water leaked from the spout.
When using the clepsydra, you must first pierce a scaled pole in the clepsydra. This pole is also called an arrow. When the water flows out or flows into the kettle, the arrow shaft will follow the water level. The time is indicated by the scale on the arrow shaft at the mouth of the pot, but this method of calculating the time will be affected by the shallow or full water, which will affect the speed of the water flowing out, so the time cannot be accurately calculated, so the only way to calculate the time is to calculate the time. It is used as a tool for rough accounting of time.
In order to solve this problem, the ancients developed a multi-level leaky engraving device. The so-called multi-level leaky engraving device is to use multiple leaky pots at a time, and connect them up and down to form a group. Water dripping from the leaking kettle can ensure that the water level in the lower kettle remains basically constant, and the dripping speed of the lower kettle can also be kept uniform, so that the measured time will be more accurate.