FOREST-TRAMWAYS. 



339 



Fi.L r . L'lii. Simple crane. 



Fi.ir. 217. -Double crane. 



Fig. 218. Windlass. 



be carried, and that the workmen incur considerable danger 

 in moving such heavy pieces of timber. At the same time 

 light trucks are essential, especially on lines with a gradient 



z 2 



