Does Lu Banchi measure the size of the door leaf or the empty space in the door frame?

It is measured according to the minimum size of the door frame, which is the size of the lamp as the saying goes.

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. According to legend, it was written by Lu Gongyun class in the Spring and Autumn Period, and it was called "Menji".

Woodworking tools are mainly used to check whether the planed plates, beams and structures are vertical and whether the edges are at right angles. 1 ruler =0.8 half a foot. Lu Banchi is an important measurement and calibration tool, which was combined with Ding Lan ruler shortly after it was produced, and then with inches and centimeters.

Extended data:

The ancient Lu half-foot was 46.08 cm long, and the modern Lu half-foot was 42.9 cm and 50.4 cm long respectively.

The ancients attached great importance to size when building houses. Architects often use white rulers to determine the overall spatial dimensions of houses, such as height, depth and width. Carpenters use Lu Banchi to measure and determine the size of doorways.

Relatively speaking, when modern people carry out architectural design and interior decoration, it is much more casual to determine the overall size of the house and the size of the door. Few people build houses and decorate rooms according to the white ruler and Lu Banchi's Geely size.