LOGGING IN THE DOUGLAS FIR REGION. 127 



There are in use in the United States seven types of steel spar- 

 skidders, each made in several different sizes. The one designed to 

 handle timber of average size in this region is equipped with 12 by 12 

 inch, double-cylinder, high-speed engines, with five drums. Then 

 there is the utility engine with 10 by 10 inch cylinders and four 

 drums. On the front of the machine there is a 12 by 12 inch swing- 

 ing-boom loading engine, mounted on a turntable. This engine drives 

 three friction drums. Up in the tower, underneath the steel spar, 

 there is a four-drum, guy-tightening engine. The skidding engine 

 has a hauling-line speed of from 500 to 800 feet per minute, and a 

 return-line speed of from 1,800 to 3,000 feet per minute. The 

 machine is mounted on a steel frame. This frame with its supporting 

 legs is raised or lowered by hydraulic jacks, to allow empty cars to 

 pass beneath it. 



The selling prices of the skidder and loading engine f . o. b. Port- 

 land or Seattle, exclusive of blocks and lines, were approximately 

 as follows in 1916 : 



Prices of skidder and loading engine. 



TEEE-EIGGED TYPE. 



(1) 12 by 12 inch skidder, 10 by 10 inch loading engine, mounted on 



a steel car $11, 500 



(2) 12 by 12 inch skidder, 10 by 12 inch loading engine, mounted on 



a steel car 12, 500 



(3) 12 by 12 inch skidder, 12 by 12 inch loading engine, mounted on 



a steel car 13, 000 



(4) 12 by 12 inch skidder adapted for mounting on a wooden sled 9, 500 



(5) 13i by 16 inch skidder adapted for mounting on a wooden sled 22, 000 



(6) 12 by 12 inch skidder, 10 by 10 inch loading engine, adapted for 

 mounting on a wooden sled 9, 700 



(7) 12 by 12 inch skidder, 10 by 12 inch loading engine, adapted for 

 mounting on a wooden sled 10, 700 



(8) 12 by 12 inch skidder, 12 by 12 inch loading engine, adapted for 

 mounting on a wooden sled 12, 500 



(9) ISi by 16 inch skidder, 10 by 10 inch loading engine, mounted on 



a steel car ^. 23, 000 



(10) 13^ by 16 inch skidder, 10 by 12 inch loading engine, mounted on 



a. steel car 1. 26, 000 



(11) 13i by 16 inch skidder, 12 by 12 inch loading engine, mounted on 



a steel car 32, 000 



STEEL-SPAE TYPE. 



(1) 12 by 12 inch skidder, 10 by 12 inch loading engine, mounted on 



a steel car ^ 28,000 



(2) 12 by 12 inch skidder, 12 by 12 inch loading engine, mounted on 



a steel car 32, 000 



