Powder mill

One component of a powder-mill, taken from Encyclopédie, published by Denis Diderot, circa 1770.
A working example of the drawing above. This is a restored edge-runner mill at Eleutherian Mills.

A powder mill was a mill where gunpowder is made[1] from sulfur, saltpeter and charcoal.

  1. ^ Knight, Edward H.. "Powder-mill" Knight's new mechanical dictionary: a description of tools, instruments, machines, processes, and engineering: with indexical references to technical journals (1876-1880). vol. 2. Boston: Houghton, Mifflin and Co., 1883. 1781. Print.