In ancient times, when the ruler was not invented, people used some simple tools to measure the length. For example, take a rope on the body and use it to compare the length when needed. The ancient Egyptians used the rope to measure the land. Some people have come up with the idea that a part of the body can be used as a measuring tool. For example, the distance between the ends of the open thumb and the middle finger (or the little finger) is called 1柞 (Zhd). The distance between the two hands when the two arms of the adult are stretched is called the distance between the two hands. 1 degree (tu cited, when measuring land in ancient China, it is often calculated by the number of steps.
As a result, fixed rulers made of wood, bone, bamboo and metal plates have appeared, but the dimensions of these feet are not equal to the length of our current market.
In ancient China, the ruler with scale was called “momentâ€, and the grid divided by the moment (ruler) was created by Luban. Another invention of Luban was to correctly draw a square with a right angle, also known as a class ruler. Can tell the craftsman which size is not the same. Mencius said that "the skill of the public is not a rule, not a square." Luban made a great contribution to the uniform size standard.
In different periods in ancient China, the length of a foot is different. The shortest is the Shang Dynasty, one foot is equal to today's 16.95 centimeters, which is about 17 centimeters. The longest one in the Song and Yuan Dynasties, one foot is equal to today's 31.68 centimeters, about 32 centimeters. The British government uses the female worker's foot as the standard, and sets its length as a "foot". Then, according to this standard unit, a certain length of wooden strip or metal strip is made as a common measurement tool. So, until today, the "foot" in English is still the meaning of "foot".
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