Ancient Lu Banchi was 46.08 cm long.
The lengths of two modern Lu Banchi are 42.9 cm and 50.4 cm respectively.
Lu Banchi, also known as "Lu Banchi" and "Lu Banchi", is a measuring tool used in building houses, similar to the ruler used by craftsmen today. Lu Banchi, about 42.9 cm long, is said to have been written by Lu Gongyun class in the Spring and Autumn Period. Later, it was added to the geomantic circle to measure the good and bad luck of houses and houses, which was called "door plan".
Also known as "square", it is mainly used to check whether the planed plates, purlins and structures are vertical and whether the edges are at right angles to each other. 1 city ruler =0.8 half a foot. Soon after, Lubanchi appeared, Ding Lan ruler was integrated, and then inches and centimeters were integrated. It is an important tool for measurement and calibration. Because of its special function, it is most widely displayed in geomantic culture and architectural culture.
Extended data
Introduction to invention
Lu Ban invented many things. According to many ancient books, he invented many woodworking tools used by carpenters. Like a carpenter's ruler, it's called Lu Banchi. Another example is Mo Dou, umbrella, saw, planer and drill. Legends are all invented by Lu Ban.
The invention of these woodworking tools liberated the craftsmen at that time from the original heavy labor, and the labor efficiency was doubled, and the civil technology took on a brand-new look. It contains the original knowledge of physics.
Lu Ban is also an outstanding mechanical inventor. The lock he made, the mechanism is inside, and there is no trace outside. It can only be opened with a matching key.
There is such a record in the book Mozi: "The loser cuts bamboo and wood, thinking it is a magpie, and flies away three days later." In other words, the wooden bird made by Luban can fly high in the air by the wind and not land for three days. There is no denying that Lu Ban is the Depth Charge of primitive aviation science.
Luban also improved the structure of vehicles and made motorized wooden chariots and horses. This kind of wooden chariots and horses is driven by Woodenhead, equipped with mechanism, and can walk automatically.
Many scientific and technological inventors in later generations, such as Ma Jun in the Three Kingdoms period, Qu Chun in the Jin Dynasty, Ma in the Northern Qi Dynasty and Ma in the Tang Dynasty, were all influenced by this legend and developed in this direction one after another.
In weapons manufacturing, Lu Ban once made siege equipment for Chu and played a great role in the war. Later, under the influence of Mozi, he stopped making such war tools and devoted himself to inventions in production and life to benefit the working people.
Of course, Lu Banchi is only the standard of ancient house furniture. In modern houses, the size of Lubanchi can only be used as a reference. In the final analysis, the size of doors and furniture is determined by the needs of human activities and the actual situation of the house. As long as the size is moderate, convenient and practical, there is no need to stick to the rules.
References:
Baidu Encyclopedia-Lu Banchi