Logging; the principles and general methods of operation in the United States . m dagos havebeen used successfully for bucking-up logs. The equipment consists of a traction engine with an aircompressor and an air storage tank. The saws which may beattached readily to a log of any size are of the drag-saw type,driven by a piston working from a small cylinder, mounted ona metal frame weighing from 60 to 75 pounds. The cylinder isconnected with the air chamber on the engine by a line of hoseof sufficient length to give a working radius of 300 feet. Threeframes and one saw are the usual equipment
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Logging; the principles and general methods of operation in the United States . m dagos havebeen used successfully for bucking-up logs. The equipment consists of a traction engine with an aircompressor and an air storage tank. The saws which may beattached readily to a log of any size are of the drag-saw type, driven by a piston working from a small cylinder, mounted ona metal frame weighing from 60 to 75 pounds. The cylinder isconnected with the air chamber on the engine by a line of hoseof sufficient length to give a working radius of 300 feet. Threeframes and one saw are the usual equipment for an outfit. Another t>pe of log-making machine, patented in 1907, isknown as the Endless Chain Saw. The essential features of themachine are an endless chain in which the links, represented bysaw teeth shaped like those of a cross-cut saw, are riveted to-gether. The backs of the teeth fit into sprockets. The chain issupported by a steel arm from 6 to 9 feet long, one end of which ispivoted to the frame carrying the machinery. This arm carries ^ See page 100. 8o LOGGING. Fig. i6. — The Endless Chain Saw used in Bucking-up Logsin the Pacific Coast Forests. a driving sprocket at the attached end and a blank sprocket atthe free end over which the chain travels. The arm is raised andlowered by cables fastened to a hght metal derrick which ismounted on the frame of the machine. Power for driving the saw is furnished by a twenty- or thirty-five-horse-power, four-cylinder gasoline engine, directly con- WOODWORKERS TOOLS AND EQUIPMENT 81 nected to the driving shaft of the saw. The machine is mountedon skids 13I feet long, shod with a light steel rail on which themachine can be moved forward or backward for a working dis-tance of 9I feet. This permits a number of cuts to be made ateach set-up of the machine. The saw, mounted, weighs about 1200 pounds. The saw cancut at any angle up to 90 degrees and is run at a speed of 2500linear feet per minute, cutting a kerf one-half inch wid