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Crystallization of saltpetre (nitre, potassium nitrate, or KN03), 1683. Saltpetre is the principal ingredient in gunpowder, and is still used in the preservation of some foods
Checking the quality of saltpetre (nitre, potassium nitrate, or KN03), 1683. Saltpetre is the principal ingredient in gunpowder, and is still used in the preservation of some foods
Production of saltpetre (nitre, potassium nitrate, or KN03), 1683. Nitre beds, heaps of manure mixed with chalky earth. These were watered with urine and manure water
