Woolwich is the great rendezvous and head-quarters of the Royal Artillery, the Military Train, and the Royal Engineers, and few troops, besides marines--who are continually moving in and out with the various men-of-war vessels--are ever quartered at Woolwich. The royal arsenal is the main attraction of Woolwich; and the principal part of the inhabitants derive their support from Government in some shape or other. The admission is by ticket; and the visitor is accompanied in his tour of inspection by policemen. The days of admission are Wednesdays and Fridays. There are generally about 12,000 men employed at the arsenal; but the ordinary visitor is not allowed to walk into the workshops where ammunition is being made. He is restricted to the paved footpaths, from whence he can see the various artificers at work. The din of hammers, the movement of wheels, the rush of steam, and the roar of the furnace, is proof of the vast extent of the manufactures which are continually going on. All kinds of shot are cast here--grape, chain, canister, bullets, and cannon-balls. Rockets, percussion-caps, metal fusees, and stores of round shot and shell are accumulated to a vast extent, the two latter being piled up in pyramids to upwards of ten millions. There are store-rooms for saddlery and arms of every description, both ancient and modern; and a park of artillery numbering upwards of 30,000 pieces, which comprise the reserve from which the army, navy, garrisons, batteries, etc, are recruited. Sentries are stationed here and there to keep people in order, as there are great numbers of all classes constantly going through the arsenal. Not the least interesting, though melancholy, feature of the place is, the gangs of convicts chained together, and dragging heavily-laden trucks from one part of the yard to another. Some of these unhappy wretches have chains attached to their leg, and the expressions of their faces are as fierce as those of a hyena, while others look completely spirit-broken.