THE ROYAL ARTILLERY INSTITUTION. 
85 
Art. 73. The extraordinary proofs of shell guns and carronades will be 
made in an analogous manner, but with a single charge of powder equal to 
the heaviest charge in use in the naval service. The howitzer of 22 centi¬ 
metres (8’66 in.) will be equally proved with the heaviest charge of powder 
and with cylindrical projectiles. The mortar a plaque of 32 centimetres 
(12‘60 in.) will not undergo the extraordinary proof. 
Art. 74. The spherical shot will be those of the service. The cylindrical 
projectiles will have the same windage as those of rifled guns of the same 
calibre; and for smooth-bores a windage in proportion to that of rifled guns. 
Art. 75. When the extraordinary proof has been ordered in consequence 
of the bursting of a gun in the ordinary proof, this proof will be applied to 
another gun taken from among those which were tried at the same time as 
that which burst, and cast from the same metal under the same circumstances. 
The orders of the minister will then be taken, a report having been made to 
him of the proof in the form prescribed by Article 76. 
Art. 76. A special proces-verbal will be made of every extraordinary proof. 
This proces-verbal will indicate the weight, origin, kind, and shade [nuance) 
of the metal which has been used in the manufacture; the duration of the 
fusion, and the important incidents of the casting. 
It will shew the result of the examination of the gun, the greater or less 
facility which has been found in the boring, and the time employed in that 
operation; the duration of the proof; the number of rounds it has borne; 
the number of pieces into which it has burst; also the shade of the metal 
observed at the fracture of the dead-head, and in the pieces of the reinforce. 
The title of the proces-verbal will shew the object proposed in making the 
proof; the circumstance which occasioned it, as well as the facts which have 
been established. 
Art. 77. When a new nature of gun is introduced into the naval service, 
two pieces of this nature will be made in each foundry ; one will be put to 
the extraordinary proof, the other to that of continuous firing. 
Art. 78. The proof by continuous firing will consist in firing carried on 
under the ordinary conditions of service with heaviest service charge, and 
continued up to the number of rounds directed by the minister. The piece 
will be washed and examined after every 25 rounds. The interval between 
each should not be less than a minute and a half, and not more than two 
minutes. 
Art. 79. The arrangements prescribed by Articles 62, 63, 67, and 73 will 
be observed in the extraordinary proofs. All extraordinary proofs will be 
made in the foundries, unless special orders are given to the contrary. 
The proofs by continuous firing will be generally made in the ports, and 
by preference at Gavre. 
Section YIII .—Rifled cannon . 
Art. 80. The manufacture of rifled cannon will be subjected, as to their 
founding, boring, and finishing, and all that belongs to it, to the regulations 
contained in the present decree. 
In addition, according to the requirements of the establishment of rifled 
guns which will compose this artillery, special ministerial instructions will 
be given. 
