A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . e air through the machine. The annexed drawing, firj. 625, represents the machine in operation at the Governor andCompanys large collieries at Cwm Avon, Glamorganshire; and the following list of licensesgranted to several large colliery proprietors, is a convincing proof that this invention rankshigh among the modern improvements of mining. The sectional view explains the internal construction, the darts showing the air-currentsascending tlie upcast pit a, from
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . e air through the machine. The annexed drawing, firj. 625, represents the machine in operation at the Governor andCompanys large collieries at Cwm Avon, Glamorganshire; and the following list of licensesgranted to several large colliery proprietors, is a convincing proof that this invention rankshigh among the modern improvements of mining. The sectional view explains the internal construction, the darts showing the air-currentsascending tlie upcast pit a, from the interior of the mine into the machine. The piston n is sliown immersed in water, which forms an air-tight packing. The front or outlet valves K are shown in the external view of the ventilator. The endof the machine is represented open in the drawing, for the convenience of showing the inletvalves E, and of explaining the internal construction. 1018 STRYCHNINE. The air-ports, or valve-work, can be made three-fourths of the area of the pistons, thusreducing tlie resistance of the air-current through the machine to a A. The upcast pit B. Hollow pistons, made of?wrought iron. c. Wrought iron tanks, restingon two blocks of uiasonry, and onsix iron pillars. D. Beam work, resting on threeblocks of masonry. E. The valve work and framing,fastened to sixteen upright pieces oftimber, 9 inches square. F. Crank wheel of steam engine. G. Piston rods. These machines can be applied to winding shafts. Cost of machines about £200, for capacities of 10,000 cubic feet of air per minute. STRYCHNINE. CH=^N??0^ The bitter poisonous principle contained in the differentvarieties of utrj/chnos. It is usually extracted for commercial purposes from the nux vomicabean, the seed of the S. nux voynica. It is a well-marked alkali, and yields a great numberof crystalline salts with acids and metallic chlorides. Its true constitution has been fullymade out by the researches of Messrs. Nicholson
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
