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Show INTER-MOUNTAI- MINING REVIEW. N 13 The North Star Power Plant. The paper read by Mr. Arthur de Foote, C. E., at the meeting of the Nos. 38 to 44 Fremont St., San Francisco, Cal. Dealers in and Manufacturers of all the latest improved MINING and MILLING MACHINERY, Stamp Mills, Challenge Ore Feeders, Triumph and Concen- Hendy-Norbo- m trators, Hoisting Engines, Boilers, Pumps, Ore Cars, Tee Rail and Mining Supplies of all kinds. Two-Stam- Improved Triple Discharge Mill, p CAPACITY 6 TO 10 TONS PER DAY. Catalogue and Prices on application. L The Mining Review REACHES THE IfflIHIKC PUBLIC. American Society of Civil Engineers, recently convened in San Francisco, elicited much interest and no small amount of discussion. The paper referred to makes a very elaborate and exhaustive report upon the operation of the compressed air transmission plant of the North Star mine in Grass Valley, Cal., a brief description of which, compiled from this report, we here present. The power station consists of a Pel-to- n wheel, 18 feet 6 inches in diameter, attached direct to the shaft of a Rix duplex air compressor, compound tandem type. The initial cylinders are 18 inches and the second cylinders 10 Inches diameter, witha stroke. The wheel is built up of angle iron plates, riveted together to break joints, and is held concentric with the shaft, with twelve pair of radial spokes of k inch rod iron, secured by nuts to the cast iron hub. The driving force, being applied to the rim, is transferred to the hub by four pairs of iron so to as form a truss. rods, arranged The wheel weighs 10,500 pounds and runs at 110 revolutions, under 750 feet head, developing upward of power. It is made of this large diameter for the purpose of giving proper speed to the compressor under the high head in this case available. The water is applied to the wheel through a variable nozzle controlled by a hydraulic 24-in- ch 2-in- 300-hor- se regulator, which maintains a uniform speed on the wheel with a variation from full head down to 25 per cent of same, making its opration absolutely automatic, as well as economizing the water supply, no more being used at any time than required for the work. The construction of the wheel, as will be seen, forms an ingenious mechanical combination, altogether novel and without precedent, affording an ample factor of safety with a very high peripheral velocity. The water supply is brought to the wheel through 2 miles of riveted pipe, affording capacity to develop A power. pipe conveys the air at a pressure of 90 pounds to the company's from the power-hous- e 800 feet distant and 125 feet eleshaft, vation. This is at present running a power pneumatic hoisting en- suf-fice- nt 22-in- ch 800-hor- se 6-in- ch WIRE TRAMWAYS PATENT ROPEWAY ROPEWAYS, INCLINE PLANES, For the transportation of Oie, Fuel and other material, has been erected by ns all over the country and is the most economical and efficient method known Nothing to get out of order; has always and RAILWAYS. Hoisting Apparatus, Patent Grip Pulleys, Transmission of Power by Wire Ropes; 25 years experience; Send for Ropeway Pamphlet given satisfaction. CALIFORNIA WIRE WORKS CALIFOGHU VIBE WOBSS WORKS: LICENSEES St., lap-wre- ld 100-hor- se HALLIDIE Office, 8 Pine ch 332 Bay Street, San Francisco, Cal. San Francisco, Cal. MILLS JIG CONCENTRATOR DISTRIBUTORS. BREAKERS. That save a vast amount of care For working the sands from To crush to any degree the separating box. and labor, divide the pulp and of fineness desired. IMPROVED MILLS. water evenly to two or more That successfully take the SLIME CONCENTRATOR, lines of concentrators. place of stamps. Works the slimes from the SEPARATORS. GRAVEL MILL, g AMALGAMATORS. Sizes the ore from the mill, Works cement gravel DRY JIG, rates the sands for the jig and away with plates of all kinds of mills for saving slimes for the slime concentrator, Concentrates ores where there without crushing the is a lack of water. gold. gravel. Continuous and Furnaces. DODGE and GIANT ROCK sepa-Doin- Charge Roasting THE ABOVE MACHINERY IS BEING SET UP AND CAN BE SEEN AT OUR STORE. DODGE MINING MACHINERY C0 SEND for circulars and catalocub. |