Fig. 16.
We commence with the stand. This is quite simple, being composed of five pieces of cigar-box wood, a rectangular base, two sides cut as shown, and two small end-pieces to give the sides stability. The measurements you can decide for yourself: we suggest a base 5 in. long and 2 in. wide, and side about 2-1/2 or 3 in. high, as being suitable to the thickness of cigar-box wood.
The cannon itself is not very difficult, if made square instead of cylindrical. The barrel is composed of four pieces of thin wood glued together as shown in Fig. 17. The pieces are about 6 in. long, and are cut and fitted to such a width as will leave a square hole in which the rod can move easily. On the under side of this barrel are fixed two pieces of wood—one about 1-1/2 in. long and 3/4 in. wide at the end near the mouth: to this the elastic will be fixed. The other, a piece about 1-1/4 in. long and square in section, is fixed about midway along the barrel, and will act as an axle on which the cannon can swing.
Fig. 17.
The rod by which the shot is ejected should be square in section, and about 5 in. long. At the rear end of it should be fixed two side-pieces to act as stops to prevent the elastic forcing the rod too far into the barrel. A nail driven through these two pieces will prevent the elastic slipping out each time the cannon is fired (Fig. 18).
Fig. 18.
All that remains now is the fixing of the elastic. It should be slipped through the slot at the end of the rod, and the two ends fixed as shown in the first illustration.