This work is performed with the help of the tables for the construction of ordnance. Eleven days are devoted to it.
Detailed Programme of the Drawing.
1. For each gun, howitzer, or mortar, a longitudinal in the direction of the axis, and at right angles to the axis of the trunnions, and a plan parallel to the axis of the bore and of the trunnions.
Besides this, for those cannon and howitzers which have dolphins, a transverse taken across the middle of the dolphins and the axis of the trunnions. For mortars, a transverse made by a plane passing in front of the dolphins, the whole on a scale of one-fifth.
2. Detail of the button (comprising the cascable and breeching loop for naval ordnance) on a scale of two-fifths.
3. Detail of the tracing of a dolphin, on the scale of two-fifths.
4. Tracing of the bush of a gun, on a scale of two-fifths, and tracing of a priming-pan at the real size.
5. For garrison ordnance, in cast-iron, detail of the widening of the base ring on a scale of two-fifths.
6. Tracing of a cannon-ball, of a howitzer-shell, and of a shell, on a scale of one-fifth.
Tracing of the lugs of a shell, ring and lug at the real size.