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Vat.

A wooden tub; used for many purposes, such as for mash, wash, hop-liquor, in brewing and distilling. Also known as a back.

As a mere storage vessel, it is a cistern or tank (which see).

Also used in many chemical and manufacturing operations in which the substances used are boiled, soaked, steeped, lixiviated, elutriated, etc. See starch; tanning; etc.

Amalgamating-vat.

A vessel used in the wet treatment of ores. See list under metallurgy.

In Fig. 6911, the tailings pass through the perforated bottom of the mixing-hopper, and descend through a pipe of such length as to balance the mercury in a retort connected with the open vat into which the tailings discharge. Within [2694] the vat is a series of horizontal and vertical concentric perforated copper partitions, which force the contents to take a devious course. The vat and retort are surrounded by steamjackets. The fumes of mercury are injected into the descending body of the tailings within the pipe.

1877.

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