Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . e time of Pliny. The mines of Idria,the Palatinate, and of New Almaden in California,are extensive and rich. The ore is also found inPeru, China, Hungary, Sweden, Jajiaii, and Chili. In the furnace the ore is subjected to distillationiu retorts which lead to condensing-chambers, or theblocks of ore are roasted in a furnace, the whole vol-atile results of the fur
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . e time of Pliny. The mines of Idria,the Palatinate, and of New Almaden in California,are extensive and rich. The ore is also found inPeru, China, Hungary, Sweden, Jajiaii, and Chili. In the furnace the ore is subjected to distillationiu retorts which lead to condensing-chambers, or theblocks of ore are roasted in a furnace, the whole vol-atile results of the furnace passing with the metal-liferous fumes to a series of CoNDENSKi;. See previous article. The latter is the ]ilan adopted at Idria in Austria,the former in Bavaria and California. Dr. Uresretort-furnace, elected at Landsberg in Bavaiia,resembles the apparatus for the distillation of coal-gas. In Spain, the old Buytrone or Aludel furnace isstill adhereil to. See Aludel. Mercu-ry-gather-er. (Metallurgy.) A stir-ring apparatus in which fluurcd quicksilver, whichhas been rendered what is technically known as *ict,is gathered together. See Amalgam. Mercury which is floured is in a sort of powdery Fig. Quicksilver- Gatherer. condition, the particles being coated with sulphurfrom the pyrites or from other cause ; and the object mp:ridiax. 1421 METAL. of the mechanical agitation and rubbing, in the mer-cury-gatherer, is to cause the globules of mercury tocoalesce ami resume the fluid condition. Me-ridi-an. A gieat circle supposed to passthrougli bntli ))oles, and the zenith and nadir of agiven place. Me-ridi-an-oircle. 1. A transit instrumentwitli a graduated circle securely fastened at rightangliS to the horizontal and turning with it. The meridian circle in the National Observatoryof Washington was maile by Ertel and Son, ofMunich. Its object-glass has an aperture of 4^inches, with a focal distance of 58 inches. This in-strument is provided with
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