Page:On the economy of machinery and manufactures - Babbage - 1846.djvu/185

Rh oxidation, in small nails, in fine wire; by the wear of tools, and of the tire of wheels, and by the formation of some dyes: but much, both of cast and of wrought Iron, returns to use.

Lead is wasted in great quantities. Some portion of that which is used in pipes and in sheets for covering roofs returns to the melting-pot; but large quantities are consumed in the form of small shot, or sometimes in that of musket-balls, litharge, and red-lead, for white and red paints, for glass-making, for glazing pottery, and for sugar of lead (acetate of lead).

Silver is rather a permanent metal. Some portion is consumed in the wear of coin, in that of silver plate, and a portion in silvering and embroidering.

Tin.The chief waste of this metal arises from tinned iron; some is lost in solder and in solutions for the dyers.