15. Length of the bore and charge of powder which satisfy the data of the programme.
16. Résumé of the results arrived at in this .
Second Section.—Thickness of Metal necessary in order that the Piece may resist the Expansion of the Gases.
17. Explanation of the method employed to resolve the question of the thicknesses of metal.
18. First propulsion of the projectile, mean density of the gases after this propulsion.
19. Second propulsion of the projectile, mean density of the gases after this propulsion.
20. Third, fourth, &c., propulsions of the projectile, mean density of the gases after each of them.
21. Density and position of the strata (of gas) at the moment of the maximum of mean density.
22. Density of the last stratum for the positions which come after that of the maximum of mean density.
23. Tensions which result from the densities found.