The mouths of the rockets being rubbed with wet meal powder, lay them in the grooves, head to tail, and tie them fast; from the tail of the first rocket, carry a leader to the mouth of the second, and from the second to the third, and so on to as many as there are on the swivel, making every leader very secure, but in fixing these pipes take care, that the quick-match does not enter the bores of the rockets; the rockets being fixed on the swivel, and ready to be fired, have a line of a hundred yards in length, stretched and fixed up tight, at any height from the ground, but be sure to place it horizontal; this length of line will do for rockets of half a pound, but if larger, the line must be longer, before you put up the line, put one end of it through the swivel, and when you fire the line rocket, let the mouth of that rocket which you fire first, face that end of the line where you stand, then the first rocket will carry the rest to the other end of the line, and the second will bring them back again, and so they will run out and in according to the number of rockets: at each end of the line, there must be a piece of flat wood, for the rocket to strike against, or its force would cut the line. Let the line be well soaped, and the hole in the swivel very smooth. Of the different Decorations for Line Rockets. To line rockets may be fixed many sorts of things, such as flying dragons, mercuries, ships, &c. Or they may be made to run on the line like a wheel, which is done in this manner; have a flat swivel, made very exact, and on it, tie two rockets obliquely, one on each side, which will make it turn round all the way it goes, and form a circle of fire; the charge for these rockets, should be a little weaker than common; if you would shew two dragons fighting, get two swivels made square, and on each tie three rockets together, on the under side; then have two flying dragons made of tin, and fix one of them on the top of each swivel, so as to stand upright; in the mouth of each dragon put a small case of common fire, and another at the end of the tail; you may put two or three port fires of a strong charge, on one side of their bodies, in order to shew them. This being done put them on the line, one at each end; but let there be a swivel in the middle, of the line, to keep the dragons from striking together; before you fire the rockets light the cases on the dragons, and if care be taken in firing both at the same time, they will meet in the middle of the line, and seem to fight. Then they will run back, and return again, with great violence, which will have a very pleasing effect. The line for these rockets must be very long, or they will strike too hard together. Of Chinese Flyers.