《天工开物·中篇·燔石》
先把煤掺和泥做成煤饼，然后一层煤饼一层石相间着堆砌，底下铺柴引燃煅烧。
先取煤炭泥和做成饼，每煤饼一层叠石一层，铺薪其底，灼火燔之。
Mix coal with mud to make coal cakes, then stack them alternately with layers of stone, light a fire under the stack, and burn it.