494 



AUXILIARY FOREST INDUSTRIES. 



than ordinary forest saws. It should be noted also that saw- 

 mill engines are often driven by burning sawdust and refuse 



Fig. 302. Transportable sawmill. 



wood instead of coal, this being rendered possible by the use 

 of special furnaces. 



Besides fixed sawmills, transportable frame-saws, termed in 

 America pony-saws, are now employed. Fig. 303 shows their 

 mode of construction : they are on wheels and are driven by a 

 belt from a locomobile ; they are valuable in forestry from the 



Fig. Ho:-$. Transportable sawmill. 



fact that it is more natural to transport saws to the forest, 

 than wood in bulk from the forest to the sawmills. 



California is at present ahead of all other countries in saw- 

 mills, not only in constructive ingenuity, but also in the use of 



