266 
LOGGING 
cross-skids, men are set to work to hew the inner faces of the 
shde thnbers. This is particular work because any irregularities 
on the face of the slide will cause logs to jump. The scoring line 
is laid off with a chalk line and the timbers then scored with a 
felling ax and finally hewed smooth with a broadax. 
A common method of dumping logs from a slide is to build 
one side several inches lower than the other. Another method 
Fig. 88. — A Whip-poor-will Switch used for thro\^-ing Logs from a Slide. 
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. The 
lower part of the slide ends at a landing, where the grade should 
Fig. 89. — A Sawed-timber Slide, a Form sometimes used when Sawed 
Material is available. 
be level or slightly 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 hea^y treenails. 
The life of a pole slide is from six to ten years, when, kept in 
repair. 
