TIMBER- SHOOTS. 



295 



Wooden timber-shoots are made with 6 or 

 4- to 12-inch diameter arranged more or les 

 two forming the base and two or three being 

 side to form a trough varying from about 2J to 

 The two bottom poles rest on the ground so 

 otherwise wooden trestles are built up for the 

 so as to maintain the necessary gradient. In 

 fuel-billets, short log sections, and long logs 

 tracted in mountain tracts ; and of course the 



8 poles of from 

 3 semicircularly, 

 ranged on each 

 5 ft. in breadth, 

 far as possible ; 

 shoot to rest on, 

 central Europe, 

 are all thus ex- 

 solidity of con- 



Turning-Point and Buffer on a Roadway Timber-Slide. 



struction varies considerably in such cases. Where the gradient 

 is below 1 in 16 or 17 (6 per cent) long logs can only, without 

 snow on ground, be shot down during frosty weather, when men 

 are kept watering the shoot to make it an ice-slide. For ordi- 

 nary winter-sliding when snow is on the ground a gradient of 

 1 in 33 to 1 in 17 (3 to 6 per cent) carries long logs, while 

 1 in 16 to 1 in 8 \ (6 to 12 per cent) is needed for small 

 log-sections and fuel-billets. For dry-sliding of long logs in 

 summer the gradient has to be 1 in 5J or 5 (17 to 20 per cent), 

 while small logs and fuel-billets need from 1 in 5 to 1 in 2J 



