The foundry number is also to be marked on the right rimbase.
Guns rejected for imperfections of any kind will have the letter C. stamped on the anchor, so as to partially obliterate it.
The founders are to be dissuaded from selling such guns to other parties, and required to break them up.
Guns rejected for such defects as render them dangerous to those who fire them, should be irreparably mutilated, with the consent of the founder.
EXTREME PROOF OF TRIAL-GUNS.
34. The extreme proof of guns intended for trial of metal, subject to such modifications by the Bureau as future experience may dictate, will be conducted as follows:
A suitable 'butt' shall be erected to arrest the flight of the projectiles used in proof, and to admit of their easy recovery, and a bomb-proof, readily accessible, for the protection of the firing party.
When practicable, the 'butt' should be made thick enough to allow the shot to just pass through, and be stopped by another beyond it, without penetrating the latter; this is, for XI-inch, about 12 feet.
With care, it is estimated that 130 shells may be fired 1,000 times, at the rate of one hundred rounds, per day.
After undergoing the ordinary proof established for its calibre and class, the gun selected for extreme proof shall be subjected to at least 1,000 rounds with service charges.