LAND TRANSPORTATION WITHOUT VEHICLES 



23 



Heavy road engine at work on holdings of 

 C. A. Smitli Timber Co., Marshfield, Oregon. 



Westingliouse-Willamette electric skidder on trial at the C. A. Smith Mill, 

 Marshfield, Oregon. 



Steam donkey engines must possess :- 



Plenty of power (large boiler capacity, so as to 



maintain pressure in spite of poor fuel). 

 Unbreakable construction. 

 Fast working speed. 

 Spark arresters and water pumps, to prevent fires. 

 With the yard engines, skidding roads are usually dispensed with. 



With the road engines, e.xcellent "roads" are used, covered closely with wide and strong ties, costing 

 in the redwood belt as much as ^5,000 per mile; or else log-troughs (pole roads) forming an immense 

 gutter through which the logs are pulled. 



The machines consist of upright boilers (100 to 200 pounds pressure) on sled runners, one or two 

 quick-acting steam engines, and two, three, or four drums. 



Well known manufacturers are: — 

 "■ » " " , ' j/f Lidgerwood Mfg. Co., 96, Liberty Street, 



New York City; Lambert Hoisting Engine 

 Co., Newark, N. J.; Washington Iron Works, 

 Seattle, Wash. ; Willamette Iron and Steel 

 Works, Portland, Oreg. 



The drums are used:- 

 To wind up the haul-in cables, (over 

 "fairleaders"), thus pulling logs or log trains 

 toward the machine; 



To play out the haul -in cable, with 

 the help of a tripline (pull-back cable) run- 

 ning over a series of sheaves or tackle- 

 blocks, having from 9 to 18 inches diameter. 

 The skidding (yarding) distance should 

 not exceed 1,200 feet. 



The cable used is the best make of 

 plough steel wire rope cable (J. A. Roebling 

 Works, Trenton, N. J., or Broderick & Bas- 



" What a steam donkey may pull." Washington Iron Works, Seattle, Wash. COm, 809, Main Street, St. Louis, Mo.). 



