(Reprinted from the "Engineering News.")
The estimation of the radius of action of a naval vessel is a problem into which there enter so many varying factors that any solution must be an approximation at best, and hence open to question and criticism. The factors affecting the coal consumption of a vessel at a given speed may be enumerated as below:
1. The condition of the ship's bottom, whether clean or foul.
2. The wind and weather conditions.
3. The quality of the coal.
4- The condition of the machinery, main and auxiliary.
5. The skill and efficiency of the personnel.
6. The original design.
7. The amount of auxiliary machinery and steam appliances in use other than those required for propelling the ship.