宋学士全集卷十五有一篇“五轮沙漏铭”。作者宋濂记詹希元以沙代水作动力,拨动齿轮、轮轴,制造时辰钟的方法甚详。其文如下:沙漏之制,贮细沙于池,而注于斗,凡运五轮焉。其初轮轴长二尺有三寸,围寸有五分,衡奠之。轴端有轮,轮围尺有二寸八分,上环十六斗,斗广八分,深如之。轴杪傅六齿,沙倾斗,运其齿钩,二轮旋之。二轮之轴,长尺围如初,从奠之。轮之围尺有 The Complete Works of Song Bachelor Volume fifteen has a “Five Hourglass Ming.” By Song 濂 记 Zhan Xi Yuan to the sand on behalf of the water as a driving force, toggle gears, axles, clock method of making a very detailed. The article is as follows: Hourglass system, storage of fine sand in the pool, and note in the bucket, where shipped five rounds Yan. The first round of two feet long two inches, surrounded by five points, the balance of lay. Shaft round wheel, wheel circumference ruler has two eight-eighths, sixteen on Sheung Wan, fighting wide eight, deep as it. Shaft 杪 Fu six teeth, sand dumping bucket, transport its tooth hook, two round of rotation. Second axis, long ruler, from lay. Wheel circumference ruler there