PART XIII.
PRACTICAL GUNNERY.
1. How may the velocity of a shot or shell be ascertained?
Approximately by the empirical formula,
V = 1600√(ac/w).
| Where | V = | initial velocity. | ||
| a = | a coefficient, whose | value depends on the windage. | ||
| c = | charge |  | in lbs. | |
| w = | weight of ball | |||
The values of a are:
| Windage. | Values of a. |
| 0.175 | 3.6 |
| 0.125 | 4.4 |
| 0.090 | 5.0 |
2. Does a shot or shell continue at the same uniform velocity during its flight?
The velocity decreases as the distance increases, in a proportion a little higher than the squares of the velocities throughout.
3. What causes a decrease in the velocity of a shot?