There have been many methods used to grind these ingredients to a powder for fireworks, such as large mortars and pestles, made of ebony, and other hard wood; likewise horizontal mills with brass barrels; but none of these methods has proved so effectual and speedy as the last invention, that of the mealing table, which is represented in Plate 1. Fig. 1. This table it made of elm, with a rim round it’s edge, four or five inches high; and at the narrow end, A, is a slider, which runs in a groove and forms part of the rim; so that when you have taken out of the table, as much powder as you conveniently can, with the copper shovel Fig. 2. you may sweep all clean out at the slider A. When you are going to meal a quantity of powder, observe not to put too much in the table at once; but when you have put in a good proportion, take the muller Fig. 3. and rub it therewith till all the grains are broke, then fearce it, in a lawn sieve that has a receiver and top to it; and that which does not pass through the sieve, return again to the table and grind it more, till you have brought it all fine enough to go through the sieve. Brimstone and charcoal are ground in the same manner as gun-powder, only the muller must be made of ebony, for these ingredients being harder than powder, would stick in the grain of elm, and be very difficult to grind; and as the brimstone is apt to stick and clod to the table, it would be best to keep one for that purpose only, by which means you will always have your brimstone clean and well ground. To prepare CAST-IRON for Gerbes, White Fountains, and Chinese Fire.