Liao Palace Plan: Female Minister of the Ministry of Industry

The success of the pulley model gave Lin Daye a secret pleasure. In the dead of night, she would use the moonlight to polish the wood, trying to improve the structure and make it rotate more smoothly and with less effort. She even secretly used a few strong hemp ropes to make a simple pulley device on the crooked-neck willow tree in the backyard of the Clothes Bureau, and tried to lift a bucket of water - it was indeed much less laborious than lifting it directly.