How did the ancients find the horizontal line?

The ancients used Mo Dou to find the horizon.

Mo Dou is a very common tool in China's traditional woodworking industry, and its use has three aspects:

1, make a long straight line (also indispensable in mud, stone, tile and other industries); The method is to fix one end of the inking ink line, pull out the inking ink line, straighten it and tighten it at the required position, then lift the middle section and bounce it off.

2. Ink storage, ink sticks and crutches are used for drawing short straight lines or marking;

3. Draw a vertical line (when using a lead pendant).

Extended data:

Mo Dou marking depends on the drawings. If the vertical height is marked on the drawings, it should be marked with a level according to the design elevation first, and then marked with elastic lines. If the length of the inclined wall is marked on the drawing, the elastic line shall be marked according to the diagonal length according to the requirements of the drawing.

Mo Dou crossed the requirements:

1, fine cotton thread should be used for inking, and the number of winding times should be reduced by ink absorption, and the stitch of the fine thread will be clear after it is bounced.

2, ink, writing ink, ink lines are not easy to fade.

3. The lifting force should be uniform, and the two ends of the line and the lifting point must be in a straight line, so that the ink line will not be biased.

Baidu Encyclopedia-Mo Dou