CANDLES, BLUE.
Saltpetre, ¼ oz. Powder, ½ oz. Sulphur, 1 oz.
CRACKERS.
The case is made of cartridge paper, the dimensions required being 15 inches by 3½ inches. First fold down one edge, about ¾ of an inch broad, then turn down the double edge about ¼ of an inch, and bend back the single edge over the double fold, so as to form within a channel, which is to be filled with mealed powder, not ground very fine; the powder is then to be covered by the folds on each side, and the whole is to be pressed by a flat ruler; and the part containing the powder is to be folded into the remainder of the paper, every fold being pressed down. The cracker is then doubled backwards, and forwards in folds about 2¼ inches, which are pressed quite close, and a piece of twine is passed twice round the middle across the folds, and the joinings secured by causing the twine to take a turn round the middle at each fold successively; one of the ends of the folds may be doubled short under, which will produce an extra report; the other must project a little beyond the rest for the purpose of being primed.
EARTHQUAKE, ARTIFICIAL.
Mix together four pounds of iron sand, and four pounds of sulphur; and after making it into a paste with water, bury it a little depth in the ground. In ten or twelve hours, if the weather be warm, the earth will swell up, and burst; flames will also issue out, scattering around a yellow and black dust.
FIRES OF VARIOUS COLOURS.
White fire is made by mixing powder with iron sand, or filings.
Red fire is made by mixing powder with iron sand of the first order.
Silver colour is made by introducing raspings of ivory.