486 



AUXILIARY FOREST INDUSTRIES. 



saw. At the downward motion of the saw-frame, the 

 ratchet q is drawn backwards, catching a cog in A 7 when the 

 saw is at its greatest height and again forcing N round at the 



;. 297. Forest sawmill driven by water-power. 



next down stroke of the saw. U is the water-wheel which 

 drives the saw, the small water-wheel W being used to drive 

 back the butt-carriage when the butt has been sawn through. 



