174 



LOGGING 



run in a tool steel channel attached to the underside of the steel 

 runner inside of the tread chain. A bearing surface of approxi- 

 mately 4^ square feet is given to each tread chain which is 

 sufficient for tractive purposes and does not tear up the road. 



The boiler which is equipped with locomotive boiler attach- 

 ments is 15 feet long, 36 inches in diameter and is built for a 

 working pressure of 200 pounds. The water tank is placed 

 under the boiler directly in front of the fire box and has a capa- 

 city of ten barrels, which will run the hauler for 5 miles. 



The engine has four vertical 6^-inch by 8-inch cyHnders which 

 transmit power by a series of gears to the rear sprocket wheel 

 on each runner. Two cylinders are placed on each side of the 

 forward part of the boiler. The log hauler weighs from 17 to 22 

 tons when loaded with fuel and water. The average cost is 

 $5000 each. 



Steam log haulers are used extensively in the Lake States, 

 in the Northeast and in Canada. 



Some advantages possessed by the machine are that the 

 annual depreciation and repairs are less than the depreciation 

 on an equivalent number of animals; the necessity of bringing 

 in large quantities of feed is obviated; and the machine can be 

 operated day and night by employing two crews. Hauls exceed- 

 ing 4 miles can generally be made cheaper with a log hauler 

 than with animals. 



The fuel most commonly used is wood because of its accessi- 

 bility. Under average conditions a cord of 2-foot fairly dry wood 

 will run a hauler approximately 8 miles, while a ton of soft coal 

 will run it about 24 miles. Watering places must be provided 

 along the road at intervals of from 3 to 5 miles. 



The operation of a hauler requires a crew of from three to 

 five men; namely, one engineer, one fireman, one pilot and one 

 or two trainmen when from ten to twelve sleds are hauled. 



The average speed with loaded sleds is 4^ miles per hour, 

 and with a train of empty sleds the speed is about 6 miles per 

 hour. 



The cost of road construction for log haulers is greater than 

 for animals because stronger bridges must be built, steep down- 



