Tumbling-barrel
The common tumbling or cleaning barrel consists of a barrel-shaped, vessel with a side opening for introducing the work, mounted on an axis, and revolved by gears or belt.
These, however, are fast becoming scarce, owing to the numerous patented inventions of various descriptions which may be obtained from the dealers at short notice.
The Henderson oblique barrel, used for burnishing and plating small brass goods as well as iron; also an exhaust-barrel for castings; the Stover exhaust for castings, nails, forgings, etc.; friction-geared, roller-geared, and encased tumbling-barrels--are only a few of the machines designed to totally eradicate the dust and noise which have hitherto been the inevitable accompaniment of these useful devices. See EXHAUST TUMBLING-BARREL. Tungsten, or Wolframite, forms with steel an alloy of remarkable hardness. It is a rare metal, derived chiefly from wolfram, a tungstate of iron and manganese. See WOLFRAM.
Tungsten-bronze is made by adding tungsten to the ordinary bronzes or brass containing copper, tin, zinc, and lead.