0.036201 × 0.5236Dd³ = 0.018955Dd³.
If we now substitute for D the specific gravity of cast-iron shot or shells = 7.000, we have,
W = 7 × 0.018955d³ = 0.134d³;
and if for D we substitute the specific gravity of lead, W = 0.2142d³; and in case of powder, W = 0.01744d³.
For diameters, weights and charges, [see Tables, pages 80-81].
35. When shot are heated to a white heat, what expansion takes place?
| Calibre. | 8-in. | 42 | 32 | 24 | 18 | 12 |
| Expansion, inches,, | 0.149 | 0.11 | 0.10 | 0.08 | 0.06 | 0.04 |
36. Do heated shot retain a permanent enlargement?
Yes; in case of the 8-in. shot, for example, after the first cooling the enlargement is 0.054 in.; and, after the second, 0.099 in.
37. Are the igniting powers of a hot shot destroyed by ricochetting upon the water?