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is placed behind the machine, and its axis pressed downby springs to keep the stuff tight as it comes off. Fouriron bars, made red hot, are introduced into the copperroll, which in half an hour acquires the proper degree ofheat, or nearly such a one as is used for the ironing oflinen : the wooden roll is then laid in its place, and themachine set to work. If more than thirty ells are to bepassed at once, the wooden roll must be changed for ano-ther, for it will not bear a longer continuance of the heatwithout danger of splitting, and therefore the manufactu-rer staould be provided with several of these rolls, thatwhen one is removed, another may be ready to supply itsroom : as soon as taken off from the machine, it shouldbe wrapt in a cloth and laid in a moist place.

The principal inconvenience, attending the use of thismachine, is, that the heat necessary for extending thegilding, though it improves the brightness of white andyellow silks, is injurious to some colours, as crimson andgreen. A double pressure will not supply the place ofheat; and the only method of preventing this injury, orrendering it as flight as possible, appeared to be, to passthe stuff through with great celerity.