The traditional Ding Lan ruler is used to measure the size of a yin house. It is also used to make shrines, carve wooden statues and make tablets of gods. A foot is one foot two inches and eight minutes long, and a foot is about 38.78 cm. It is divided into ten squares, engraved with the cross of "wealth, loss, honor, death, official, righteousness, suffering, honor, harm and determination". It is more appropriate to use auspicious words.
There are several cells under each cell, such as "losing money", "withdrawing children", "leaving to die" and "running away from home". On the architectural scale, we should avoid "death", "suffering", "loss" and "harm" and adopt "determination", "prosperity" and "separation".
The use of Lu Banchi in Yangzhai building is based on its geomantic theory and the guidance of meteorology. Mainly used in Shenting, kitchen stove, Shending, master room and study room. The building shall be subject to the actual size of the partition wall, and the doors and windows shall be subject to the inner window of the window frame. Regarding the size and actual height of the Divine Table, it is best to follow this Lu Banchi.
The floor ruler, also known as "quasi-floor ruler", is a measuring tool used in building houses and houses, similar to the bending ruler used by craftsmen today. Lu Banchi, about 42.9 cm long, is said to have been written by Lu State Public School in the Spring and Autumn Period. Later, eight characters were added to the geomantic circle to measure the good and bad luck of houses and houses, which was called "door plan".