f. Case shot from 6 or 12-pounders, also from short or long 24-pounders and 7 and 50-pound howitzers at different distances against planks, and both with case shot, and grape shot, for observing the effect:
aa. Of different charges.
bb. Of different weights of the entire case.
cc. Of the weight and size of balls used.
dd. There is also to be observed the scattering, the number of hits and wide balls, and determination of the best line.
g. Shrapnel shells from field-pieces against planking.
5. The number of the before-named rounds is not to be too great, partly not to increase expense, partly in regard to time, since the practice is intended for instruction, and therefore not to be hurried. Still for shot, shell, and grape shot, ten rounds is the minimum, if a result is to be drawn; for the small mortar five rounds are sufficient.
Notwithstanding this limit, it will not be possible to take the practice all in one year. It seems, therefore, expedient to divide the whole into two portions, so that the most important practice happens indeed in each year, generally however, in one year the practice is to take place with field-pieces, in the following year with siege-pieces, so that the student who is present once in the first year and once in the second can complete the necessary course.
The teachers have, therefore, to determine, in the proposed plans for these exercises, the sort and number of rounds they judge necessary for the following year.
C. Practice in the Laboratory.