(Art. 30, O. D., U.S.A.)
A careful and complete chemical analysis shall be made of the metal of each heat from which the projectiles are manufactured under these specifications.
Tests for the Detection of Initial Strains Bordering on Rupture
(Art. 31, O. D., U.S.A.)
After final treatment and before acceptance for the ballistic test, all A.P. shot must be cooled to a temperature of about 40° F., and then suddenly heated by being plunged into a bath of water at a temperature of from 180° F. to 212° F., as the Chief of Ordnance may direct. When thoroughly heated to this temperature each projectile must be plunged, with its axis horizontal, halfway into a bath of water at a temperature not greater than 40° F., and after a brief period shall be turned 180° for a like immersion of the opposite side, after which the projectile shall be removed from the bath.
This test shall be made in the presence of the inspector, and an interval of at least three days must elapse between the final treatment and the submission of the projectiles to this test. This test is not required for shell.
Ballistic Test
(Art. 32, O. D., U.S.A.)
Each lot of projectiles shall be subjected to the following ballistic test:
After a final treatment and on presentation of the entire lot for the ballistic test, the inspector shall select three projectiles to represent the lot, which shall be finished, inspected and delivered in the same manner as required for the rest of the lot.