THE ROYAL ARTILLERY INSTITUTION. 
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modified mixture will not be brought into use until authority shall have 
been received. 
Section Y.— On the management of reverberatory furnaces , and on the 
manufacture of guns. 
Art. 44. No metal of first fusion, whatever be its origin, will be employed 
in the manufacture of guns, unless it shall have borne the extraordinary 
proof, as pointed out in Art. 72. 
Art. 45. The coal employed in the manufacture of guns should be 
chosen of the best household quality ( premiere qualite pour la grille) , and 
the supply should contain as much lump coal as possible. 
Art. 46. The furnaces will be charged in such a manner as to present 
the pieces most difficult to melt to the sharpest action of the fire. The 
metal will be placed upon bricks, so as to be surrounded in the most 
complete manner by the flames. The fire will be managed so as to obtain 
complete fusion and the highest temperature in the shortest possible time, 
and that care must be taken that simultaneous fusion should take place in 
the furnaces of which the products are to be united. 
Care will be taken, before charging the furnace, to make a little barrier of 
loam perpendicular to the axis of the furnace. This barrier, which is 
intended to prevent the first fused metal from running to the vent before 
this part is well heated, will be removed at the fitting time by the founder. 
During the fusion, the door by which the furnace is charged will not be 
opened, except in case of absolute necessity, and the stirring of the metal 
will be made, if it is considered desirable, through the small door (porte du 
regard ) made for watching the progress of the smelting. 
Art. 47. When possible, the maximum charge for furnaces actually in 
use, will be 2400 kilogrammes (5294 lbs.), and must not in any case exceed 
2600 kilogrammes (5735 lbs.) 
Art. 48. The government foreman will keep specially for the rever¬ 
beratory furnaces a journal analogous to that pointed out in Art. 31 for the 
smelting furnaces. He will inscribe in this journal,— 
(1) The numbers of the furnaces whose products have been united. 
(2) The origin of the metal, weight, aspect of fracture, its shade and 
number, in order. 
(3) The time employed in the fusion. 
(4) The kind and quantity of the combustible employed. 
(5) The appearance of the metal when run. 
(6) The number of the piece cast. 
(7) The other products obtained from the rough metal, slag, clinker, &c. 
(8) The accidents which may have occurred during the fusion and sub¬ 
sequent operations. 
He will add any useful details. 
[vol. in.] 
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