The flying saucissons have commonly 7 lines of interior diameter and 5 inches of height. A long match is fastened within the case, and extends out through the choke. That part of the case beyond the choke, a length of 2 inches, is set over a rounded base block, which holds it in position, while the other 3 inches of length are loaded. The composition used is the same as that for serpents of three cards. Each part of the charge should be small, and, after it has been put in place, the match which has been threaded through the case is given a turn over the surface of the composition. The repetition of this procedure after each charging insures that the match inclosed within the composition shall be arranged as a spiral. The match extends a half-inch beyond the end of the saucisson, and the choke is primed. The case is then reversed, and the empty section is filled with grain powder. A wadding is placed in position above the powder, and this end is duly choked. (Pl. V, figs. 5, 6, and 7.)
Saucissons thus prepared are placed over the charge in pots proportioned to their size - usually 16 inches long. The effect of the saucissons on being discharged from the pots is to twist while mounting, and to terminate their flight with a loud report. This spiral movement is given to them from the winding direction taken by the fuse, which burns more quickly than does the composition, and thus marks out a path in the burning material that follows the revolutions of the spiral and impresses this torsion on the charge as it is consumed.