| Eleva- tion. | 8 Ounces. | 12 Ounces. | 1 lb. 8oz. | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Flight. | First Graze. | Ex- treme Range. | Flight. | First Graze. | Ex- treme Range. | Flight. | First Graze. | Ex- treme Range. | |||||||||
| deg. | Sec. | Yards. | Yards. | Sec. | Yards. | Yards. | Sec. | Yards. | Yards. | ||||||||
| 1 | 1 | ¹⁄₂ | 156 | - | From 800 to 1200 | ||||||||||||
| 2 | 2 | 293 | 2 | ¹⁄₂ | 350 | - | From 1100 to 1300 | 707 | - | From 1400 to 1600 | |||||||
| 3 | 2 | ¹⁄₂ | 363 | 3 | ¹⁄₂ | 355 | 758 | ||||||||||
| 4 | 3 | ¹⁄₂ | 462 | 4 | 679 | 849 | |||||||||||
| 5 | 4 | 587 | 3 | ¹⁄₂ | 641 | 1075 | |||||||||||
| 6 | 4 | 621 | 5 | 941 | 1150 | ||||||||||||
| 7 | 4 | ¹⁄₂ | 898 | 6 | 1020 | 1300 | |||||||||||
| 8 | 5 | 781 | |||||||||||||||
Ranges with French brass field guns, with round shot.
| Kind. | Charge. | Elevation. | Range in Toises. | |||||
|---|---|---|---|---|---|---|---|---|
| Lines of Tan. Scale. | Deg. | M. | ||||||
| 12 Pr. | 4 lbs. | - | L. M. | — | 58 | 300 | ||
| 2 | 1 | 3 | 350 | |||||
| 10 | 1 | 39 | 400 | |||||
| 14 | 1 | 49 | 450 | |||||
| 16 | 1 | 56 | 480 | |||||
| 8 Pr. | 2¹⁄₂ lbs. | - | L. M. | — | 58 | 300 | ||
| 6 | 1 | 24 | 350 | |||||
| 12 | 1 | 51 | 400 | |||||
| 16 | 2 | 8 | 450 | |||||
| 20 | 2 | 24 | 480 | |||||
| 4 Pr. | 1¹⁄₂ lbs. | - | L. M. | — | 58 | 250 | ||
| 4 | 1 | 20 | 300 | |||||
| 8 | 1 | 40 | 350 | |||||
| 12 | 2 | — | 400 | |||||
| 16 | 2 | 20 | 450 | |||||
| 18 | 2 | 40 | 480 | |||||
The above are in old French weights and measures.
Definitions of Gunnery. 1. The impetus at any point of the curve is the perpendicular height to which a projectile could ascend, by the force it has at that point; or the perpendicular height from which a body must fall to acquire the velocity it has at that point.
2. The diameter to any point of the curve is a line drawn through that point perpendicular to the horizon.
3. The points where the diameters cut the curve are called vertexes to these diameters.
4. The axis is that diameter which cuts the curve in its highest or principal vertex, and is perpendicular to the tangent at that point or vertex.
5. The ordinates to any diameter are lines drawn parallel to the tangent at the point where that diameter cuts the curve, and intercepted between the diameter and curve.
6. The absciss is that part of the diameter which is intercepted between the ordinate and the curve.