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Steam-tank.

A chamber heated by steam, used for various purposes in the arts, such as steaming wood, paper-stock, rendering fats, etc. See under the various heads.

Tank for treating matters with steam.

Fig. 5729 shows an apparatus for treating vegetable, mineral, and animal matters with steam. The matter to be treated is placed in the retainer, which is run into the boiler, one end of the latter being removable The retainer is a wire-work cylinder supported by a metallic frame, whose circumferential ribs carry rollers to support the retainer when rotated Some of these rollers are fixed in casters which are turned by a rod and worm gear to serve as supports when the retainer is run out on to the truck. A perforated pipe, axially attached to and removable with the retainer. communicates with pipes outside the boiler to allow introduction of chemicals. The grate is removable with its supporting truck.

Fig. 5730 represents a steamchamber in which wood is treated, to preserve it. The timber-chamber is charged with superheated vapor, which is subsequently condensed, and the pores of the wood filled with an oleaginous preservative material admitted from a reservoir. See wood, preservation of. See also lard-tank; etc.

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