. Canadian forest industries 1885. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 352 THE CANADA LUMBERMAN. CUNNINGHAM'S PATENT OSCILLATING TWIN ENGINE FOR STEAM FEED IN CIRCULAR MILLS WITH RACK OR ROPE. This Engine has practically but two moving part*, aside from cranks and shafts. The whole array of eccentrics, valves, valve rods, connecting rods, cross heads, slides, le ers, rock shafts, hell cranks, etc., is done away with, and the very perfection of n/wfl''^*", compactness, durability and cheapness attained. The above engraving illustrate
. Canadian forest industries 1885. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 352 THE CANADA LUMBERMAN. CUNNINGHAM'S PATENT OSCILLATING TWIN ENGINE FOR STEAM FEED IN CIRCULAR MILLS WITH RACK OR ROPE. This Engine has practically but two moving part*, aside from cranks and shafts. The whole array of eccentrics, valves, valve rods, connecting rods, cross heads, slides, le ers, rock shafts, hell cranks, etc., is done away with, and the very perfection of n/wfl''^*", compactness, durability and cheapness attained. The above engraving illustrates the Twin Engine, 10x16, for Rope Feed, for Saw Mill Carriages. The spool is 27 in. diameter, 30 in. face, is grooved 2 in. pitch for 1| in. rope. The shaft ia steel, 4£ in. diameter, with disk cranks. No connecting rods, eccentrics or valve rods to get loose and out of order. The ports are in the trunions, and worked by an oscilliation of the cylinders, and are held in their place in the downward motion by a steam cushion below. The sawyer's valve is a perfect balance, and by moving this, valve the engine can be reversed, stopped or started almost instantaneously if necessary, as the sawyer has perfect control of it by his lever either to go fast or slow. Should the sawyer let go of his lever either by mistake or any other cause, it is balanced so that the valve will come to the centre and cut the steam off both cylinders and stop the feed. When standing, the lever is locked or fastended, so that is is impossible for it to start off itself. The engine stands upright below the carriage, and bolted to two upright beams, placed on the mill for the purpose. When a rack is preferred in place of the rope, we put on a steel wheel 30 in. in diameter, and the engine placed high enough to work into the rack on carriage bar, or if the beams come in the way, an idler wheel can be used between engine and rack segs ; or, the'engine can be placed at a distance and have a shaft fromXto tne
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectforestsandforestry
