Roughness or corrosion of the metal on the exterior, produced by neglect or exposure.
Similar injuries in the bore, or any enlargement of the bore, which is to be ascertained by measuring with the star-gauge, at every one-fourth (1/4) of an inch from the bottom of the cylindrical part to the seat of the shot, every inch from that point to the trunnion, thence every 5 inches to the muzzle, and the results recorded in the usual form, and reported to the Bureau, that they may be compared with those noted at the original inspection.
In rifled cannon, cracks or injuries produced by firing, or the rupture of shells, are to be sought for:—
Around and in rear of the vent bouching;
On the top of the bore, between the trunnions and reinforce band.
On the lower side of the bore, near the seat of the shot, at the junction of the lands and grooves.
Near the inside of the muzzle, caused by explosion of shells.
Care is to be taken that the distinguishing marks and numbers are always accurately noted, that the correct history of each gun may be preserved.
58. Before sailing, the Inspector of Ordnance will furnish the commander with a descriptive list of his battery, together with a statement of the number of times each gun on board has been fired, in the following form; a copy of which the commander shall transmit to the Bureau before sailing: this list shall be returned to the Inspector of the Yard to which she may return, with all additional firing noted opposite the number of each gun, certified "correct" by the commander.
In the list furnished by the Inspector, if the "number of fires" is estimated, it is to be entered in red ink (See Arts. 62-64), and so carried forward in the subsequent returns.