《天工开物·下篇·佳兵》
硫黄横向的爆发威力大，所以用于爆破的火药成分是硝七硫三。
硫性主横，爆击者硝七而硫三。
The lateral explosive power of sulfur is great, so the gunpowder composition used for detonation has seven parts saltpeter and three parts sulfur.