80 
MINUTES OE PEOCEEDINGS OE 
The contractors will be required to keep and exhibit a regular registry of 
their castings certified by themselves. 
Art. 39. Out of the metal chosen as specified in Art. 37 will be taken 
that which is required for the trial gun, as pointed out in Art. 40. 
If the gun bears the proof, the lot will be received; otherwise, it will be 
rejected, as no more metal produced from the same founding can be received. 
Still a second proof may be made, under the authority of the minister, 
according to the results of which the director w r ill give his opinion as to the 
reception or rejection of the said metal. 
Section IY .—Mixture of metals. 
Art. 40. The mixtures submitted for the approbation of the minister 
will be defined by their kind, their origin, and their shade [nuance). The 
castings from these mixtures will be assorted in such a manner as to cause 
them to take the shade which is recognized as good in the establishment for 
the calibres to which each of them is destined. The mixtures will be pre¬ 
sented in the form of a schedule, on the following model 
Name of Foundry. Mixture No. 
Description, origin, 
and appearance of the 
metal. 
Proportions 
by origin. 
Number of 
the Class. 
Nuance. 
Proportion 
by Class. 
Nuance. 
Mean result¬ 
ing Class. 
Nuance. 
Eemarks. 
First C 
melting, j 
Second > 
melting. 1 
When a mixture has been determined on, and proved in one or more 
calibres, it will be reproduced as exactly as possible, both in origin and 
shade, whenever guns of the same calibres are to be manufactured. 
Art. 41. The mixture for the gun of 30, No. 1, used for passing the 
metal received, will contain at least 50 per cent, of the metal which is to be 
tried. The proportion of metal of other origin which enters into this 
mixture, will be determined in each foundry, so as to come as near as 
possible to the mixture approved for current manufactures. This mixture, 
when once determined upon, will remain as the standard in the foundry for 
each supply. 
Art. 42. The mixtures of metals for the current manufacture of guns, 
cannot be admitted until they have borne the extraordinary proof of the 
calibres for which they are destined. 
The mortars a plaque, of 32 centimetres (12*60 in.), will be cast of the 
mixture used in the foundry for the largest calibre experimented upon. 
Art. 43. Whenever, in consequence of a change in the state of supplies, 
it is necessary to modify this mixture, the director will report to the 
minister, giving his reasons as to the advisability of a new proof. The 
