The height of each mountain pillar is determined by the depth, for example, the depth of one foot and two feet is divided into four steps, two steps for each slope and three steps for each step. Step one, add five lifts, with a height of one foot and five inches. The second step, according to the seven lifts, the height is two feet and one inch. Add six inches of leveling water, and make a truss with one third of the purlin diameter, two inches and three points long, and the eaves column is eight feet high and one foot, two feet, four inches and three points long. ……
This record has the following three inspirations for us:
(1) The horizontal distances from eaves to Jinfang and Jinfang to ridges are divided into equal parts according to the depth of front and rear eaves columns, and each part is called one-step frame.
(2) The horizontal distance from the eaves fang to the gold fang is called the eaves step, and the horizontal distance from the gold fang to the ridge fang is called the ridge step.
(3) The vertical distance from the eaves to the golden eaves is obtained by five strokes, that is, three feet by five tenths of the eaves, and the vertical distance is one foot and five inches; Similarly, the vertical distance from the gold cube to the ridge is three feet multiplied by seven-tenths of the ridge step, resulting in a vertical distance of two feet and one inch. To sum up, it can be seen that the lifting frame directly determines the slope of the roof. In the case of five purlins, the depth is small and the highest lift is seven. If it's seven, nine or eleven purlins, the rise and fall will be as high as eight or nine. The lifting method makes the tile slope of the wooden structure building in China a curve rather than a straight line. The curve is steeper up and gentler down, as stated in the examination record.