The carriage and slide are similar to those of the 11-inch iron pivot-carriage, except with regard to the recoil check, which is exactly the same in principle as that of the directing-bar carriage.
Ericsson’s Friction Recoil Carriage.
GUNPOWDER.
Cubical Powder.
Hexagonal Powder.
Gunpowder is classed in accordance with its size of grain as follows:
| Hexagonal Cubical | not | less than | 70 | nor | more than | 75 | grains | to the pound. |
| Mammoth | ” | ” | 0.5 | ” | ” | 1 | inch | measurement. |
| Rifle | ” | ” | 0.3 | ” | ” | 0.5 | ” | ” |
| Cannon | ” | ” | 0.1 | ” | ” | 0.3 | ” | ” |
| Torpedo | ” | ” | 0.1 | ” | ” | .15 | ” | ” |
| Small-arm | ” | ” | 0.05 | ” | ” | .06 | ” | ” |
| Shell | ” | ” | .02 | ” | ” | .06 | ” | ” |