Water Device , by al jazari , 1206 , illustration, miniature , Abbasid Period style , from the series The Book of Knowledge of Ingenious Mechanical Devices
A drawing of a balance scale on a page in a foreign language.
A drawing of a balance scale. The balance scale is drawn in orange and yellow. There are numbers on the bottom of the scale. There is a blue line coming from the right side of the balance scale to the left side.