《太平广记·卷二百六十二·嗤鄙五》
张巡官说：你见过炼铁炉用的一种铁制的长棍吧，就是这个。熔炉里烈火炽热，铁水中也有没熔化的，就使用这种铁棍时常探进炉中去捅火烧，之后退出来，过一会儿再用它去捅捅火，再退出来，只有这样才是叨铁。说完便走了。
炉中猛火炎炽，铁汁或未消融，使此杖时时于炉中橦猛火了，却出来，移时又橦猛火了，却出来，只此是叨铁也。
Officer Zhang said: "You have seen that long iron rod used in the iron smelting furnace, right? That is it. The fire in the furnace is fierce, and there is iron in the water that has not melted, so this iron rod is used to prod the fire in the furnace all the time, and then it is pulled out, and after a while it is used to prod the fire again and pulled out again. Only this is called "imposition." He then left.