| Columbiads. | Howitzers. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Iron. | Iron. | Brass. | |||||||
| Sea-Coast. | Siege and Garrison. | Field. | Mountain. | ||||||
| 10-in. | 8-in. | 10-in. | 8-in. | 8-in. | 24-pdr. | 32-pdr. | 24-pdr. | 12-pdr. | 12-pdr. |
| in. | in. | in. | in. | in. | in. | in. | in. | in. | in. |
| 0.12 | 0.12 | 0.12 | 0.13 | 0.13 | 0.14 | 0.15 | 0.14 | 0.10 | 0.10 |
9. What amount of windage is allowed to mortars?
| IRON. | BRASS. | IRON. | ||||
|---|---|---|---|---|---|---|
| Heavy. | Light. | Stone Mortar. | Coehorn 24-pdr. | Eprouvette. | ||
| inches. | inches. | inches. | inches. | inches. | inches. | inches. |
| 0.13 | 0.13 | 0.13 | 0.13 | — | 0.14 | 0.025 |
83]
PART VIII.
GUNPOWDER.
1. What are the ingredients in gunpowder?
Saltpetre, charcoal and sulphur.
2. What are the proportions?
In the United States, 75 to 76 saltpetre, 14 to 15 charcoal, and 10 sulphur.
| England, | 75 | Saltpetre, | 15 | Charcoal, | 10 | Sulphur. |
| France, | 75 | “ | 12½ | “ | 12½ | “ |
| Prussia, | 75 | “ | 13½ | “ | 11½ | “ |