The number of pieces which are used in making up a musket is forty-nine, each of which has to be formed and finished separately. Of these there are only two—viz., the sight and what is called the cone-seat, a sort of process connected with the barrel—that are permanently attached to any other part; so that the musket can at any time be separated into forty-seven parts, by simply turning screws, and opening springs, and then put together again as before. Most of these parts are such that they are formed in the first instance by being forged or rather swedged, and are afterward trimmed and finished in lathes, and milling engines, or by means of files. Swedging, as it is called, is the forming of irregular shapes in iron by means of dies of a certain kind, called swedges, one of which is inserted in the anvil, in a cavity made for the purpose, and the other is placed above it. Cavities are cut in the faces of the swedges, so that when they are brought together, with the end of the iron rod out of which the article to be formed between them, the iron is made to assume the form of the cavities by means of blows of the hammer upon the upper swedge. In this way shapes are easily and rapidly fashioned, which it would be impossible to produce by blows directed immediately upon the iron.
THE BLACKSMITH'S SHOP.
The shop where this swedging work is done at the Armory contains a great number of forges, one only of which however is fully represented in the engraving. The apparatus connected with these forges, differing in each according to the particular operation for which each is intended, is far too complicated to be described in this connection. It can only be fully understood when seen in actual operation under the hands of the workman. The visitor however who has the opportunity to see it thus, lingers long before each separate forge, pleased with the ingenuity of the contrivances which he witnesses, and admiring the wonderful dexterity of the workman. There is no appearance of bellows at any of these works. The air is supplied to the fires by pipes ascending through the floor from a fan blower, as it is called, worked by machinery arranged for the purpose below.
THE STOCKING SHOP.
The Stocking Shop, so called, is the department in which the stocks to which the barrel and the lock are to be attached, are formed and finished. The wood used for gun stocks in this country is the black walnut, and as this wood requires to be seasoned some years before it is used, an immense store of it is kept on hand at the Armory—sufficient in fact for four years' consumption. The building in which this material is stored may be seen on the right hand side in the general view placed at the head of this article. It stands off from the square, and behind the other buildings. The operations conducted in the stocking shop are exceedingly attractive to all who visit the establishment. In fact it happens here as it often does in similar cases, that that which it is most interesting to witness is the least interesting to be described. The reason is that the charm in these processes consists in the high perfection and finish of the machines, in the smoothness, grace, and rapidity of their motions, and in the seemingly miraculous character of the performances which they execute. Of such things no mere description can convey any adequate idea. They must be seen to be at all appreciated.
A gun stock, with all the innumerable cavities, grooves, perforations, and recesses necessary to be made in it, to receive the barrel, the lock, the bands, the ramrod, and the numerous pins and screws, all of which require a separate and peculiar modification of its form, is perhaps as irregular a shape as the ingenuity of man could devise—and as well calculated as any shape could possibly be to bid defiance to every attempt at applying machinery to the work of fashioning it. The difficulties however in the way of such an attempt, insurmountable as they would at first sight seem, have all been overcome, and every part of the stock is formed, and every perforation, groove, cavity, and socket is cut in it by machines that do their work with a beauty, a grace, and a perfection, which awaken in all who witness the process, a feeling of astonishment and delight.
The general principle on which this machinery operates, in doing its work, may perhaps be made intelligible to the reader by description. The action is regulated by what are called patterns. These patterns are models in iron of the various surfaces of the stock which it is intended to form. Let us suppose, for example, that the large cavity intended to receive the lock is to be cut. The stock on which the operation is to be performed is placed in its bed in the machine, and over it, pendant from a certain movable frame-work of polished steel above, is the cutting tool, a sort of bit or borer, which is to do the work. This borer is made to revolve with immense velocity, and is at the same time susceptible of various other motions at the pleasure of the workman. It may be brought down upon the work, and moved there from side to side, so as to cut out a cavity of any required shape; and such is the mechanism of the machine that these vertical and lateral motions may be made very freely without at all interfering with the swift rotation on which the cutting power of the tool depends. This is effected by causing the tool to revolve by means of small machinery within its frame, while the frame and all within it moves together in the vertical and lateral motions.