Ma Lin taught the carpenters here the circle cutter method to produce round table surfaces.
How would primitive people understand any of this?
How do several wooden planks form a round table surface?
First, process the planks into polygonal shapes, assemble them, fix them in place, and then polish them, smoothing the edges.
They have a grinding wheel driven by a bowstring to polish wood and stone, and it works quite well.
The wooden frames are also relatively easy to make.
People from other tribes come wanting to trade animal skins, textiles, seeds, special stones for items like ironware, better-made tables, chairs, and clothing.
Ma Lin would tell them that if they are willing to help with work, they can get a price discount when trading.
So, some people help him pull the bowstring, which he uses to craft various items.
The bowstring is a mechanical drive method using the principle of the bow drill, producing a relatively fast rotation.
