As high as 180 nails have been found in the door-posts of a car. 



short lumber and No. 3 and No. 4 boards, all of which are 

 generally surfaced on one side. The jack pine are usually 

 somewhat the stronger as the boards are somewhat thicker 

 and better grade. A large bulk of the lumber comes from 

 small or portable mills which specialize on that kind of work. 

 The doors are generally made at the mills and are usually 

 made and hauled as fast as the lumber is cut. This saves 

 handling and piling the lumber around the mill. They 

 nail much easier when lumber is freshly cut, but are heavier 

 and not as easy to haul. The greatest disadvantage of mak- 

 ing them of green lumber is that when the boards dry and 

 shrink, cracks are often left that will cause leakage of grain. 



19 



