Illustrated book

Two pages from an illustrated book by an unknown artist, showing technical drawings of a wooden structure. The pages are side by side, with the left page showing a front view and the right page showing a side view. Both drawings are in black ink on a beige background. The left drawing depicts a rectangular structure with a flat top and bottom, and two sections in the middle with an 'X' shape. The right drawing shows a similar structure but with a more detailed view of the side, including vertical lines and a protruding section in the middle. There are Chinese characters written in black ink at the top and bottom of each drawing. The pages have a decorative border around the edges.