File:Report of the Geological exploration of the fortieth parallel (1871) (14750914105).jpg

Identifier: reportofgeologic31871unit (find matches)
Title: Report of the Geological exploration of the fortieth parallel
Year: 1870 (1870s)
Authors: United States Geological Exploration of the Fortieth Parallel (1867-1881) King, Clarence, 1842-1901 Hague, A. (Arnold), 1840-1917 Emmons, Samuel Franklin, 1841-1911 Hague, James D. (James Duncan), 1836-1908 Meek, F. B. (Fielding Bradford), 1817-1876 Hall, James, 1811-1898 Whitfield, Robert Parr, 1828-1910 Ridgway, Robert, 1850-1929 Watson, Sereno, 1826-1892 Eaton, Daniel Cady, 1834-1895 Bien, Julius, 1826-1909
Subjects: Geology Mines and mineral resources Paleontology Botany Birds
Publisher: (Washington : Govt. Print. Off.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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first operation is performed in Briickners revolving cylinders andthe last in barrels. Mr. Bruckners cyHnder is a contrivance designed to roast ores with saltat a much less cost for manual labor than is involved in the operation of thereverberatory furnace. It is a horizontal cylinder, constructed of iron, usuallyboiler-plate, and lined with fire-brick. Its form and some of the details ofits construction are shown on Plate XXXVI. It is commonly about 11 or12 feet long and 5 or 6 feet in diameter. It is supported on rollers, i, sothat it may turn freely when set in motion by the revolving gear, h. Oneend of the cylinder communicates with a brick fireplace, A, while the oppo-site end, C, is let into the stack so that the flame from the fireplace passesthrough the interior of the cylinder. Within the cylinder there is a dia-phragm, or partition, running longitudinally through the greater part of itslength. This partition is made of iron and covered with fire-proof material. Plate :SSXVI.
Text Appearing After Image:
Braecioiers Hevolviiig Cylinder A.Fueplttce. B Body of Cylinder. C End cMeriny Stack. d. Door. e. Section of partition/,r Ribs g Ft-angesorgindes.A. I^miort and revotmig geart. RoRers Scale. SB. SILVEE MINING IN COLORADO. 611 It is usually made in sections, e, wliicli are held in grooves that are formedin the ribs, f. These ribs are made in tubular form with open ends, which,extending outward beyond the side of the cylinder, permit the passage ofair and are thus partially cooled. When the several sections are in place, the entire partition, or dia-phragm, has the form of a rhomb, whose ends are obtuse angles. It is placedat an angle of 10° or 15° with the longitudinal axis of the cylinder, so thatas the cylinder, containing a charge of ore, is revolved, the diaphragm causesa continuous passing and repassing of the material from one end to the otherand insures at the same time an intimate mixture of the whole mass. Adoor, d^ for the charging and discharging of the ore, is placed in t

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