元朝科学家郭守敬,十五六岁时就表现出了对科学研究的潜质。那时,他得到一幅“莲花漏图”(莲花漏是一种计时器,由北宋科学家燕肃在古代漏壶的基础上改制而成。图上画的器具由好几部分结成。上面有几个漏水的水壶,壶内水面高度要保持不变,往下漏水的速度保持均匀。这样,漏水量就能显示出时间变化。 Yuan Shou Guo Shoujing scientists, fifteen or sixteen years showed the potential for scientific research. At that time, he got a “lotus drain map.” (The lotus drain is a type of timepiece that was reconstructed by the Northern Song Dynasty scientist Yan Su on the basis of an ancient sour pot. There are several leaky water bottle, the height of the water inside the jug to remain unchanged, the rate of leakage down to maintain uniform, so that leakage can show time changes.