Upon a vertical shaft turning with this wheel, there is fixed a bronze "turning-like-the-wind wheel" (hsuan feng lun) which has (only) 3 cogs, the distance between these being 1.2 inches. (This turns the following one.) In the middle is a horizontal wheel, 4 ft in diameter, and 12 ft circumference, with 100 cogs, the distance between these cogs being the same as on the "turning-like-the-wind wheel" (1.2 inches).
upon a vertical shaft turning with this wheel there is fixed a bronze "turning-like-the-wind wheel" (hsuan feng lun) which has (only) 3 cogs the distance between these being 12 inches (this turns the following one) in the middle is a horizontal wheel 4 ft in diameter and 12 ft circumference with 100 cogs the distance between these cogs being the same as on the "turning-like-the-wind wheel" (12 inches)