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DESCRIPTION OF THE PLATE.
Fig. 1.—A. is the entering rammer or driver. It is bored in such a manner, that the whole of the broach, or piercer above the nipple, n, may be admitted. The cavity of the bore is cylindrical, and equal in diameter to that of the foot of the broach. This driver serves to fix the rocket case, over the broach, in the mould G, and to form the cup, o, fig. 10, for receiving the priming.
B. is the driver of the first charge. It is bored in such a manner, as to admit the broach to within two-fifths of the interior diameter of the case, from its base. Its bore is cylindrical, and has the diameter of the broach, at the height of two-fifths the interior diameter of the case.
C. is the driver of the second charge, and admits the broach two-thirds of its length; the diameter of its bore being the same as that of the broach, at one-third of its height.
D. is the driver of the third charge, and admits one-third of the broach; the diameter of the bore being that of the broach, at two-thirds of its height.
E. is the last driver, and is solid; the charge being above the summit of the broach. See page 231.