They are then fired twice with the charge in the following table, with one shot and two high junk wads, and examined with a searcher after each round.
In this examination they must not have any hole or cavity in the bore of two-tenths of an inch in depth behind the first reinforce ring, or one-fourth of an inch in depth before this ring.
| PROOF CHARGES. | ||||||||
| Nature | 42 Pr. | 32 Pr. | 24 Pr. | 18 Pr. | 12 Pr. | 9 Pr. | 6 Pr. | 3 Pr. |
| Charge, in } | 25 | 21½ | 18 | 15 | 12 | 9 | 6 | 3 |
| pounds } | ||||||||
BRASS GUNS.
From 3 to 12 pounders the diameter of the bore must not vary more than ·025 of an inch, nor in any dimensions more than ·2.
| PROOF CHARGES. | |||||||
| Nature | 12 Pr. | medium. | 12 Pr. | light. | 9 Pr. | 6 Pr. | 3 Pr. |
| Charge | 4 lb. | 4 lb. | 3 lb. | 2 lb. | 1 lb. | ||
The 12 pounders are fired twice, the remainder three times. Any hole ·15 of an inch upwards, or sideways in the bore, or ·1 in the bottom, between the breech and first reinforce; or ·2 of an inch upwards, or sideways, or ·15 in the bottom of the bore before the first reinforce ring, will be sufficient to condemn them.
MORTARS, AND HOWITZERS.
The exterior dimensions are in no respect to deviate more than ·1 of an inch in the 10, and 8 inch Howitzers, and ·05 of an inch in the 24, and 12 pounder Howitzers, and Royal and Coehorn Mortars, and Howitzers. Their bores and chambers must not deviate from their true diameters, or positions more than ·025 of an inch.