Note 9 — SECTION VI. Rockets.

Fig. 11 represents an apparatus for boring Rockets when driven solid—should this method be attempted, it is one of the simplest kind that can be used: A B are two movable blocks hollowed out at their edges to receive the Rocket. C D are two screws in each, going through two sides of the frame to make them fast. E is a brace carrying a shell-bit in dimensions proper for the Rocket. Fig. 16 is a similar bit fixed in a handle; which is useful in cleaning out the bore when the Rocket is taken from the blocks.