On the right hand end of the building, and extending quite across it from side to side, is a sort of platform, the upper surface of which is formed of cast-iron, and contains grooves in which the muskets are placed when loaded, side by side. A train of gunpowder is laid along the back side of this platform, so as to form a communication with each barrel. The train passes out through a hole in the side of the building near the door. The bank of clay may be seen sloping down from within its shed into the room on the left. The artist has represented the scene as it appears when all is ready for the discharge. The barrels are placed, the train is laid, and the proof-master is just retiring and closing the door. A moment more and there will be a loud and rattling explosion; then the doors will be opened, and as soon as the smoke has cleared away the workman will enter and ascertain the result. About one in sixty of the barrels are found to burst under the trial. The pieces that fail are all carefully examined with a view to ascertain whether the giving way was owing to a defect in the welding, or to some flaw, or other bad quality, in the iron. The appearance of the rent made by the bursting will always determine this point. The loss of those that failed on account of bad welding is then charged to the respective operatives by whom the work was done, at a dollar for each one so failing. The name of the maker of each is known by the stamp which he put upon it at the time when it passed through his hands. The barrels that stand this first test are afterward subjected to a second one in order to make it sure that they sustained no partial and imperceptible injury at the first explosion. This done they are stamped with the mark of approval, and so sent to the proper departments to be mounted and finished. [Illustration: TESTING THE BAYONETS.] The bayonets, and all the other parts of which the musket is composed are subjected to tests, different in character indeed, but equally strict and rigid in respect to the qualities which they are intended to prove, with that applied to the barrel. The bayonet is very carefully gauged and measured in every part, in order to make sure that it is of precisely the proper form and dimensions. A weight is hung to the point of it to try its temper, and it is sprung by the strength of the inspector, with the point of it set into the floor, to prove its elasticity. If it is found to be tempered too high it breaks; if too low it bends. In either case it is condemned, and the workman through whose fault the failure has resulted is charged with the loss. THE FORGING.