To prepare your chest, you must lay a quick-match, in all the grooves, from hole to hole; then take some sky rockets, and rub them in the mouth, with wet meal powder, and put a bit of match up the cavity of each, which match, must be long enough, to hang, a little below the mouth of the rocket; your rockets and chest being prepared, according to the above directions, put the sticks of the rockets, through the holes in the top and bottom of the chest, so that their mouths may rest on the quick-match in the grooves; by which all the rockets, will be fired at once; for by giving fire to any part of the match, it will communicate to all the rockets, in an instant. As it would be rather troublesome, to direct the sticks from the top, to the proper holes in the bottom, it will be necessary to have a small door in one of the sides, which when opened, you may see how to place the sticks. Flights of rockets, being seldom fired at the beginning of any fireworks, for which reason, they are in danger of being fired, by the sparks from wheels, &c. Therefore to preserve them, a cover should be made to sit on the chest, and the door in the side kept shut. Of Serpents or Snakes for Pots des Aigrettes, Small Mortars, Sky Rockets, &c. Serpents for this use, are made from two inches and an half, to seven inches in length, and their formers from three sixteenths, to five eights of an inch diameter, but the diameter of the cases, must always be equal to two diameters of the former: they are rolled and choaked like other cases, and filled with composition from five eights of an inch, to one inch and an half high, according to the size of the mortars, or rockets, they are designed for, and the remainder of the cases, bounced with corn-powder, and afterwards their ends pinched and tied close: before they are used their mouths must be primed with wet meal-powder. Of Leaders, or Pipes of Communication. The best paper for leaders, is a large sort of white paper, called Elephant, which you cut into long slips, two or three inches broad, so that they may go three or four times round the former, (but not more) for when they are very thick, they are too strong for the paper which fastens them to the works, and will sometimes fly off, without leading the fire: the formers for these leaders, are made from two, to six sixteenths of an inch diameter, but four sixteenths is the size generally made use of; the formers are made of smooth brass wire; when you use them, rub them over with grease, or keep them wet with paste, to prevent their sticking to the paper, which must be pasted all over; in rolling of pipes, make use of a rolling board, but use it lightly; having rolled a pipe, draw out the former with one hand, holding the pipe, as light as possible with the other, for if it press against the former, it will stick and tear the paper.