TIMBER SLIDES AND CHUTES 



233 



A common method of dumping logs from a slide is to build 

 one side several inches lower than the other. Another method 

 used where there are several dumping grounds is to hew down 

 the side of the slide on the dump side and place a switch 

 called a " whippoorwill " diagonally across the slide timbers. 



Fig. 65. — A Whippoorwill Switch used for throwing Logs from a Shde. 



The lower part of the slide ends at a landing, where the grade 

 should be level or sHghtly ascending to check the speed of the 

 logs. When the log strikes the switch it is shunted off. When 

 it is desired to send logs past a given dump the upper end of the 

 switch is removed and placed across the depression on the slide 

 timber and fastened by two heavy treenails. 



Fig. 66. — A Sawed Timber Slide, sometimes used where the Wear is Excessive. 



The Hfe of a pole slide is from six to ten years, when kept 

 in repair. 



SKdes which are near a sawmill and subject to constant use 

 are preferably made from sawed timbers. 



On the Pacific Coast slides called "fore-and-aft" roads or 

 "pole chutes" are used for trailing logs from yarding engines 



