As mentioned earlier, the Code of Work of the Ministry of Industry stipulates that the bucket mouth is the basic unit for weighing the bucket arch and even all large wooden components, and the construction method is based on materials.
The book has the following provisions on "materials", "bookshelves" and "points":
1. All building systems are based on materials, and they are used because they are as big as eight houses.
The first class is nine inches wide and six inches thick (divided into six points);
2. Put a frame on the quarter material with a thickness of six minutes, which is called sufficient material.
All the profound and famous things in the house have rules and regulations, and the system is based on the division of materials used.
On the basis of these three provisions, combined with other chapters in the book, it can be considered that wood refers to the square wood whose section height and thickness are equivalent to those of arch materials, and the specific dimensions of eight kinds of wood include the types of wood used by official houses of various grades and sizes at that time. One tenth of the thickness of wood is called one minute. , which can be used to measure various components of big wood. The frame is a square wood slightly smaller than the height and thickness of wood, which is located between trees or between trees. In the book "Building French Style", materials, shelves and dots are often used to illustrate dimensions and practices. Therefore, understanding the meaning of the three is convenient for further study of the book.
When the frame is not placed between the beams of the bucket, such beams are called single-beam beams, which can often be treated like this when placed parallel to the width direction of the building. On the contrary, a frame is placed between the rafters, which is called an all-wood rafter, and it is often encountered between the rafters and the eaves perpendicular to the width of the building.