Composition for the Crosses, or Arms, of Detonating tubes.
| grains. | |
| Chlorate of potassa | 230 |
| Antimony | 230 |
| Glass, finely pounded | 73 |
Brass tubes, common, are 3 inches long, and the cups, previous to being stamped, are one inch in diameter.
They are filled similarly to common quill tubes.
FRICTION TUBES.
These tubes are of copper, and are three inches in length. The detonating composition is inserted in a tin arm, into which is introduced and pressed down tight, by the sides of the aim, a piece of copper, grooved; with a small ring to receive the cord for firing the tube, and gun.
WADMILTILT.
Length, 14 ft. 6 in. Breadth, 11 ft. 6 in. Weight, 50 lb.
WOODEN BOTTOMS.
They are riveted to shot for brass guns to prevent the bore being indented in front of the seat of the shot by the first impulse of the powder: and to Shells, to keep the fuze in the centre of the bore.