TIMBER SLIDES AND CHUTES 
269 I 
bolted to skids placed transversely under them at intervals of 
from 10 to 15 feet, thus providing a stable foundation. Side 
braces placed at intervals of 15 or 20 feet prevent the poles 
from spreading. The slide follows the ground level except where 
Fig. 92. — A Timber Chute for bringing Logs dowTi Steep Slopes. New 
Hampshire. 
it crosses deep depressions or streams, when it is supported on 
cribwork. The roads are built as straight as possible to decrease 
the loss of engine power through friction. 
A fore-and-aft road requires from 90,000 to 120,000 board feet of 
