Before leaving the subject of tools and appliances, some notice should be taken of the picture by Jan Breughel (1575-1632) entitled “Venus at the Forge of Vulcan” (Kais. Friedrich Mus., Berlin, No. 678), which measures 54 cm. by 93 cm. Here all the various operations of the armourer and gun-founder are shown, with a large quantity of armour, weapons, bells, coins, and goldsmith’s work. The details of especial interest are the grindstones and “glazing-wheels,” and the “tilt-hammers” worked by water-power, which were probably the machines used in the “battering-mills” more than once alluded to above. These water-turned hammers continued in use in England up to the first quarter of the nineteenth century,[59] and are still found in Italy at the present day. They are raised by wooden cams or teeth set round the axle of the water-wheel, to which a handle is fixed on the near side for use when water-power was not available. The chisel-edge of the hammer is for stretching the metal by means of a series of longitudinal hammerings. Of the grindstones actuated by the same water-power, the larger would be for rough work, the second for finer finish, and the smallest, which is probably a wooden “buff,” would be used for the high polish at the end. It is impossible here to give a detailed description of this very interesting picture, which has been considered elsewhere by the present author.[60] At the same time the tools shown in this workshop are worthy of notice as being part of the stock-in-trade of the armourer of the seventeenth century. [Illustration: _PLATE IX_ FRONT AND BACK OF BRASSARD, 1470 INSIDE OF LEG ARMOUR OF SUIT ON PLATE VIII CUISSE, 1470] [Illustration: FIG. 17. Burring-machine or “Jenny” (see frontispiece).] To the left of the tilt-hammers, in the foreground, are a pair of large bench-shears, and above them, on a cooling-trough, just below the magpie, is a long-handled swage for stamping grooves and edgings on metal plates. Tongs, pincers, and hammers are found in many parts of the picture, and dies for stamping coins or medals are seen immediately below the bench-shears. Directly under the right foot of Vulcan is a tracing-wheel, similar to that shown on Jost Amman’s engraving of the “Compass Maker” in his _Book of Trades_. A small bench-vice lies near the lower margin of the picture under the figure of Cupid, and a hand-vice and repoussé hammer on the three-legged stool to the left. In the distance, over the figure of Venus, is the primitive contrivance for boring a cannon, the mould for casting which is seen close by in the floor. The most interesting detail is to be found in the machine which lies at the foot of the small anvil at Cupid’s right hand. This bears a strong resemblance to the modern burring-machine or “jenny,” used for turning up the edge of thin metal plates (Fig. 17).