Formers for marrons, are from three quarters of an inch, to one and a half diameter; cut the paper for the cases, twice the diameter of the former broad, and long enough to go three times round; when you have rolled a case, paste down the edge, and tie one end close, then with the former drive it down to take away the wrinkles and make it flat at bottom, then fill the case with corn powder one diameter and a quarter high, and fold down the rest of the case tight on the powder; the marron being thus made, wax some strong pack-thread, with shoemakers wax; this thread wind up in a ball, then unwind two, or three yards of it, and that part which is near the ball, make fast to a hook; then take a marron, and stand as far from the hook as the pack-thread will reach, and wind it lengthwise round marron, as close as you can, till it will hold no more that way; then turn it, and wind the pack-thread on the short way, then lengthwise again, and so on till the paper is all covered; then make fast the end of the pack-thread, and beat down both ends of the marron, to bring it in shape. The method of firing marrons, is by making a hole at one end with an awl and putting in a piece of quick-match, then take a piece of strong paper, in which wrap up the marron, with two leaders, which must be put down to the vent, and the paper tied tight round them with small twine; these leaders are bent on each side, and their loose ends tied to other marrons, and are nailed in the middle to the rail of the stand, as may be seen by Fig. 37. The use of winding the pack-thread in a ball, is, that you may let it out as you want it, according to the quantity, the marron may require; and that it may not be tied in knots, which would spoil the marron. Of Marron Batteries. Those batteries, if well managed, will keep time to a march, or a slow piece of musick. Marron batteries are made of several stands, with a number of cross rails, for the marrons, which are regulated by leaders, by cutting them of different lengths, and nailing them tight, or loose, according to the time of the musick. In marron batteries you must use the large and small sort of marrons, and the nails for the pipes, must have flat heads. Of Line Rockets. Line rockets are made and drove in the same manner as sky rockets, but have no heads, and the cases must be cut close to the clay; they are sometmies made with six, or seven changes, but in general not more than four, or five; the method of managing those rockets, is as follows; first have a piece of light wood, the length of one of the rockets, turned round about two inches and a half diameter, with a hole through the middle lengthwise, large enough for the line to go easily through; if you design four changes, have four grooves cut in the swivel, one opposite the other, to lay the rockets in.