It can also be said that the flat foot is 1 108.89 square centimeters. Level ruler is a special term used by calligraphy and painting circles when creating calligraphy and painting works on rice paper. Whether in calligraphy or rice paper industry, the default size of a flat ruler is 34/34 cm. In the creation of calligraphy and Chinese painting works, if the size is less than 34/34 cm, it is also calculated as a flat ruler by default, as long as the size of rice paper is not less than 0. 12 cm.
In the geometric measurement of lever, the reference straight line is expressed by simulation method, and the level used is mostly cast iron level and rock level. The measuring surface of cast iron level ruler is machined by scraping method, which can store lubricating oil and contain dust, which increases the stability and reliability of benchmark use. Rock level has the advantages of wear resistance, stability and convenient use.
Introduction to the types of spirit level
1, mechanical level: including strip level (rectangular level with a base measuring surface and fixed level bubbles or adjustable relative to the base measuring surface), frame level (frame level with a base measuring surface and two vertical measuring surfaces and fixed level bubbles or adjustable relative to the base measuring surface) and magnetic level with magnetic side.
2. Electronic level: an electronic level with a display lamp instead of a bubble. By observing the color of the display lamp, you can intuitively see whether it is horizontal or not. There is also a more intuitive digital level, which can directly display numbers, but it is not durable, so it is rare.
Reference to the above content: Baidu encyclopedia ruler