《墨子·52章 备城门》
门扇上安木桩的地方都凿上一寸深的穴，每穴安一根木桩，木桩长两寸，有一寸露在外面。木桩间隔七寸，厚厚地涂上泥巴来防火。
门扇薄植，皆凿半尺一寸，一涿弋，弋长二寸，见一寸相去七寸，厚涂之以备火。
Chisel a one-inch-deep hole in places where wooden stakes are placed on the door. Install a wooden stake in each hole. The wooden stake is two inches long and one inch protrudes. The wooden stakes are placed seven inches apart and coated with mud to prevent fire.