Logging; the principles and general methods of operation in the United States . of the boiler, and at 165pounds steam pressure develops 60 horse-power. Power istransmitted to the traction wheels by chains, and either wheelmay be driven independently of the other. This is especiallyadvantageous in making sharp turns. A radius of 25 feet ispracticable in operating a train of five cars. Water tanks with a capacity of from 400 to 700 gallons arecarried on the frame directly in front of the boiler. The averagewater requirement per day of ten hours is from 2500 to 3000 194 LOGGING gallons. From i| t
Logging; the principles and general methods of operation in the United States . of the boiler, and at 165pounds steam pressure develops 60 horse-power. Power istransmitted to the traction wheels by chains, and either wheelmay be driven independently of the other. This is especiallyadvantageous in making sharp turns. A radius of 25 feet ispracticable in operating a train of five cars. Water tanks with a capacity of from 400 to 700 gallons arecarried on the frame directly in front of the boiler. The averagewater requirement per day of ten hours is from 2500 to 3000 194 LOGGING gallons. From i| to 3 cords of hardwood fuel, i to 2^ tons ofsteam coal or from 200 to 300 gallons of fuel oil are required. A special type of 3-\vheeled wagon is often employed for haul-ing logs and lumber with this engine. The front wheel is 3I feetin diameter, has a 12-inch tire and supports about one-fourth ofthe load. The remainder of the weight is borne on two rearwheels each 4^ feet high and with 16-inch tires. The load isborne on a frame built to carry from 10 to 12 tons. •TK?K»M|. 1?^- , wl:.l-j«pl\. Fig. 51. — a Holt Three-wheeled Traction Engine hauhng Sugar Pine Logs. California. The manufacturers claim that a 60-horse-power engine willhaul a load of from 40 to 60 tons at a speed of from 2 to 3 milesper hour, ascending grades as high as 10 per cent. Thirty thou-sand feet of green lumber loaded on three trucks have been hauledup a 10 per cent grade, and 15,000 feet of logs have been hauledon two four-wheeled wagons o\er a rough log road down a17 per cent grade. An engine hauling empty wagons travels3 or 4 miles per hour. WHEELED VEHICLES 195 Caterpillar Gasoline Tractor} — This type represents a depar-ture from the ordinary form of engine, for the traction wheels arereplaced by a special traction device similar in character to thatused on a steam log hauler. The front end of the engine is carried on a single wheel whichalso furnishes a means for steering. The engine is a four-
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