introducing, as it does, into every department of the Armory, a spirit of attention, skill, and fidelity, which marks even the countenances and manners of the workmen, and is often noticed and spoken of by visitors. In fact none but workmen of a very high character for intelligence, capacity, and skill could gain admission to the Armory--or if admitted could long maintain a footing there. The welders are charged one dollar for every barrel lost through the fault of their work. They earn, by welding, twelve cents for each barrel; so that by spoiling one, they lose the labor which they expend upon eight. Being thus rigidly accountable for the perfection of their work, they find that their undivided attention is required while they are performing it; and, fortunately perhaps for them, there is nothing that can well divert their attention while they are engaged at their forges, for such is the incessant and intolerable clangor and din produced by the eighteen tilt hammers, which are continually breaking out in all parts of the room, into their sudden paroxysms of activity, that every thing like conversation in the apartment is almost utterly excluded. The blows of the hammers, when the white-hot iron is first passed under them and the pull of the lever sets them in motion, are inconceivably rapid, and the deafening noise which they make, and the showers of sparks which they scatter in every direction around, produce a scene which quite appalls many a lady visitor when she first enters upon it, and makes her shrink back at the door, as if she were coming into some imminent danger. The hammers strike more than six hundred blows in a minute, that is more than _ten in every second_; and the noise produced is a sort of rattling thunder, so overpowering when any of the hammers are in operation near to the observer, that the loudest vociferation uttered close to the ear, is wholly inaudible. Some visitors linger long in the apartment, pleased with the splendor and impressiveness of the scene. Others consider it frightful, and hasten away. FINISHING OPERATIONS.--BORING. From the Middle Water Shops, where this welding is done, the barrels are conveyed to the Upper Shops, where the operations of turning, boring and grinding are performed. Of course the barrel when first welded is left much larger in its outer circumference, and smaller in its bore, than it is intended to be when finished, in order to allow for the loss of metal in the various finishing operations. When it comes from the welder the barrel weighs over seven pounds: when completely finished it weighs but about four and a half pounds, so that nearly one half of the metal originally used, is cut away by the subsequent processes.