boards and the wider the battens, the stronger it is. A door 

 of wide boards and narrow battens is very weak and bulges 

 badly if loaded heavy. 



The lumber used is largely jack pine, and made from the 

 boards in the rough. The larger mills make doors from their 



Showing how grain doors are cut to pieces to release the grain or to 

 remove them from the cars. 



18 



