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 . at the ore is iirst broken up andwashed, then roasted and ground to a fine was placed in a reducing-furnace to expel vola-tile metals, and the remainder was again ground andfarther reduced in crucibles. He speaks also ofbreaking-machines used for crushing the silex asbeing shod with pieces of iron weighing 150 were probably iron-shod sta
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 . at the ore is iirst broken up andwashed, then roasted and ground to a fine was placed in a reducing-furnace to expel vola-tile metals, and the remainder was again ground andfarther reduced in crucibles. He speaks also ofbreaking-machines used for crushing the silex asbeing shod with pieces of iron weighing 150 were probably iron-shod stamps. See Gold. Wtateer is excellent in art proceedsFrom labor and endurance : deep the oakMust sink in stubborn earth its roots hopes to lift, its branches to the skies:Gold cannot gold appear, until mans toilDiscloses wide the mountains hidden ribs,And digs the dusky ore, and breaks and grindsIts gritty parts, and laves in limpid streams,With oft-repeated toil, and oft in lireThe metal purifies; with the tedious process of its painful works,The lusty sicken, aud the feeble die. Dyer, Tl\e Fleece, 1757. Ore-roastiiig Furnaoe. (Metallurgy.) Onefor heating powdered ores to drive otf sulphur, ar- Fig. 3420. Stetefddt Furnace, ORE-SXIELTING FURNACE. 1572 ORGAN. Fig. 3421. the lighter portions fallingheavier nearer to, the dibk rereived in the various grooves C Cof the circular trougli, and are sweptinto their apiirnpriate chutes byhrushes DUE attached to armsF F, which are fastened to a circu-lar toothed rack A H rotated bya pinion driven by belt connectionwith the main shaft. In Fig. 3422, the broken ore de-scends from a spout on to the inclinedsieve By through the meshes of whichan upward current of air is passedfrom the bellows C. This is operatedby the cam-wheel D, yokes D UD, and levers D-; these latter arefarther from, and the I adjustable on the wheel to regulate the working of the; the diHerent sizes are | bellows, which is provided with valves c c,
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