120 



THE SAWMILL 



(B) THE CARRIAGE. 



I. The composing parts are: -The truck with head blocks, knees, dogs, setworks, and the driving 

 machinery. 



The carriage is subject to the roughest treatment. Still, its proper alignment is as essential as that 

 of the saw: — 



Carriage 



(a) The truck in small mills is 

 strongly braced and bolted. 



Construction material is:- 



Up North — Norway pine, 

 birch, and maple. 



Down South — yellow pine 

 and white oak. 



The length of the carriage 

 should correspond with the maxi- 

 mum length of the logs. 



So-called screw block trail- 

 ers may be added, increasing the 

 length (in longleaf pine mills) up 

 to 72 feet. 



(b) The head blocks, iron 

 with steel face, are let into the 

 timbers of the truck and form a 

 groove for the tongue of the 

 knee, which slides on the head 

 blocks, being moved forward and 

 backward by the set works. 



The head block and knee 

 form a right angle into which 

 the log is firmly pressed. 



(c) The knee is either solid 

 or hollow and carries the dogs. 



Head block, with knet and sed works. Wheland Machine Works, 

 Chattanooga, Tenn. 



