We have not yet spoken of the machine guns. These weapons are, as part of the regular equipment of armies, quite modern, though the idea of binding together a quantity of barrels and then discharging them at once, or with great rapidity one after another, is not altogether novel. Sometimes, instead of a number of barrels, one only is required, and the cartridges are discharged from short barrels or chambers which are brought in turn into position with the longer one. This is the ordinary revolver system; but modern machine guns are a great improvement on this method, and entirely dispense with the necessity of loading separate chambers. Machine guns have succeeded one another with extraordinary rapidity, and a gun seems only to be adopted in order to be superseded. Thus we have had during the last few years a series of these weapons bearing the names of Gatling, Gardner, Nordenfelt, and Maxim, described on a later page. [Illustration: Nordenfelt-Palmcrantz Gun mounted on Ship's Bulwark.] As we walk about the factory we see, besides the workmen, here and there groups of men in military uniform. These are armourer sergeants, who attend classes at which they are taught the mysterious mechanism of the breech-loaders and machine guns. In former days, Tommy Atkins could be instructed how to keep his weapon in order, lock and all; but now its complications are beyond the power of his understanding or of his fingers, perhaps of both, and he has to hand over his rifle to a more skilled superior when it is out of order. Truly, military matters, from the movement of the vast army corps of the present day down to the mechanism of the soldier's weapons, have become a highly technical matter. LORD ARMSTRONG AND THE ELSWICK WORKS.