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Usually the mechanical stirring furnaces give trouble and should be avoided, but the horse-shoe type possesses qualifications worthy of consideration. Of these the best known to me are: The Howell-White, the Bruckner, the Thwaite-Denny, and the Molesworth. The Bruckner is a cylinder, turning on the horizontal axis and carried by four rollers.
It was the extraordinary fineness of the gold saved by amalgamation as against my tests of the ore by fire assay that put me on the track of a most indefensible loss. The Howell-White Furnace.
The furnace is fired with coal on a grated hearth, built at the lower end; it is more economical both in fuel and in labour than an ordinary reverberatory furnace. The Thwaite-Denny Revolving Furnace. This new type of furnace, which is fired with gaseous fuel, is stated to combine the advantages of the Stetefeldt, the Howell-White, and the Bruckner.
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