The machinery for rolling lead has to be very powerful. The appliance eonsistsof alougfrarne, near the centre portion of which are two steel rollers turned by steam or other power. The lead is first cast into a slug of the width of the mill, and a few inches thick. This is ran on loose rollers, fitted in the frame, up to the steel rollers, between which it is passed, the latter rollers being held a certain distance apart by means of adjusting screws. The slug is passed to and fro between the rollers, which are brought closer together after each passage, until the lead is reduced to about 1/4 in. to 3/8 in. in thickness. The sheet is then folded and again passed between the rollers: for very thin sheets it is again folded and again passed through until the desired thickness is attained. As the tenacity of lead is very low, very thin sheets cannot be made singly. The price of milled lead is not very much more than that of pig lead, and it can be bought for considerably less than it can be manufactured on a small scale.