302 LOGGING 



to receive or discharge a ij-inch steel driving cable and provides 

 a straight lead on to the main drum. 



The cable runs through one of the open sheaves on the end 

 of the frame, passes under and three times around the gypsy 

 wheel, then passes out from under the drum through the other 

 open sheave. The lead sheaves hold the cable just 2 feet inside 

 of the rail. On curves the cable is held in place by wooden pegs 

 placed far enough apart to clear the sheaves. The base of the 

 latter is level with the rail head and when the cable has been 

 picked up and has passed around the drum, the opposite sheave 

 deposits it again in its proper position on the ground. The cable 

 is stretched tight and is fastened to stumps or other rigid sup- 

 ports at the head and base of the incline. The remaining 6 feet 

 between the cable and the other rail is used as a runway for logs 

 and is saddled out midway between the wire and the rail to form 

 a channel. 



When a standard-guage track is used there is not sufficient 

 room between the rails for both the cable and the logs. The 

 Dudley is then equipped with two gypsy wheels and two cables, 

 one of which operates just outside of each rail. The cable is 

 prevented from binding on curves by differential gears which 

 permit the drums to travel at different speeds when rounding 

 curves. 



On roads of this character care must be taken to avoid sudden 

 changes of gradient, otherwise the cable when at rest will not 

 remain in contact with the cross skids. 



When the Dudley is to be used to drag the logs the roadbed 

 is made of cross skids from 24 to 36 inches in diameter and 10 

 or 12 feet long, placed 6 or 8 feet apart, center to center, and on 

 these 40-pound rails are laid. 



As the large gypsy wheel revolves in one direction or the other 

 the Dudley is pulled forward or backward, the cable remaining 

 stationary. 



The logs are made up into turns connected by means of 

 grabs. On a road in Oregon, 14,000 feet long, having grades 

 ranging from 5 to 20 per cent a machine of this type hauled 

 from 15 to 20 logs (25,000 to 30,000 feet) per turn. The speed 



