_To drive or ram Rockets._--Rockets are filled hollow, otherwise they would not ascend, and there is not a part that requires greater attention than this stage of the process. One blow more or less with the mallet will spoil the ascent. The charge of rockets must always be driven above the piercer, and on it must be rammed a thin head of clay; through the middle of which bore a small hole to the composition, that when the charge is burnt to the top, it may communicate its fire through the hole to the stars in the head. To a rocket of four ounces, give to each ladle-full of charge 16 strokes; to a rocket of 1 lb., 28; to a 2-pounder, 36; to a 4-pounder, 42; and to a 6-pounder, 56; but rockets of a larger sort cannot be driven well by hand, but must be rammed with a machine made in the same manner as those for driving piles. The method of ramming wheel cases, or any other sort in which the charge is driven solid, is the same as sky-rockets. When you load the heads of your rockets with stars, rains, serpents, crackers, scrolls, or any thing else, according to your fancy, remember always to put a ladle-full of meal-powder into each head, which will be enough to burst the head and disperse the stars, or whatever it contains. _Decorations for Sky-rockets._--Sky-rockets may be decorated according to fancy. Some are headed with stars of different sorts, such as tailed, brilliant, white, blue, and yellow stars, &c. Some with gold and silver rains; others with serpents, crackers, fire-scrolls, and marrons; and some with small rockets and other devices, as the maker pleases. LENGTH OF ROCKET-STICKS. For rockets of 6 lb. 0 oz. the stick must be 14 ft. 10 in. long 4 0 12 10 2 0 9 4 1 0 8 2 0 8 6 6 0 4 5 3 Having your sticks ready, cut on one of the flat sides at the top a groove the length of the rocket, and as broad as the stick will allow; then on the opposite flat side cut two notches, for the cord which ties on the rocket to lie in; one of these notches must be near the top of the stick, and the other facing the neck of the rocket; the distance between these notches may be easily known, for the top of the stick should always touch the head of the rocket. When your rockets and sticks are ready, lay the rockets in the grooves in the sticks, and tie them on. We will now proceed to the charge for sky-rockets. ROCKETS OF FOUR OUNCES. lb. oz. Meal-powder 1 4 Saltpetre 0 4 Charcoal 0 2 ROCKETS OF EIGHT OUNCES. lb. oz. Meal-powder 1 0 Saltpetre 0 4 Brimstone 0 3 Charcoal 0 1-1/2 ONE POUND.