168 



Total consumption in U. S., 1921 : 



9,192,704 M shingles. 

 Conversion factor 9 cubic feet per M shingles. 



9,192,704 M X .0681 = 626,023 M, or 

 X 9 = 5,634,207 cubic feet. 

 The years on which our data are based are given below : 



Fuel 1922 Veneers 1921 



Cross-ties 1921-1922 Shingles 1921 



Mine timbers 1922 Piles 1922 



Posts 1922 Poles 1922 



Cooperage 1921 Lumber 1920 



NOTES 2, 3, AND 4. — Automobilcs. 



Note 2. — Although cars are made largely of other materials, yet 

 the average quantity of wood used in their construction was: 



Passenger cars, Trucks. All cars. 



Year board feet board feet board feet 



1921 184.8 231 189 



1922 173.6 217 176 



Note 3. — Consumption of lumber in the United States for Auto- 

 mobiles (from National Automobile Chamber of Commerce) : 



1920 Passenger cars 1.883,158 board feet. 

 Trucks 322,039 



Total used, approximately 400,000,000 



1921 Passenger cars 1,514,000 

 Trucks 147,550 



Total lumber used 313.800,000 



1922 Passenger cars 2.406,396 

 Trucks 252.668 



Total lumber used 468,074,640 



Note 4. — According to the Forest Products Laboratory, the pro- 

 portion of lumber used in passenger cars and trucks bears the relation 

 of 160 to 200. U. S. figures show that in 1922 trucks made up 9.5 per 

 cent and passenger cars 89.5 per cent. Multiplying 160 by 89.5 and 200 

 by 9.5, a weighted average of 162.2 is obtained. But the total average 

 is actually 176 feet, or 108.5 per cent of the trial average. The average 

 for each class is obtained by increasing the 160 to 200 feet by 108.5 

 per cent, which gives the values shown in table . . . 



The figure on consumption for both classes has been obtained by 

 taking 3 per cent of the output of the U. S. for each class, autos and 

 trucks, and multiplying by these figures. The Forest Products Labora- 

 tory gives 12,000,000 board feet for passenger car bodies alone, not 

 counting blocking and other incidental uses. It is not certain whether 

 the figures for actual output for Illinois arc 3 per cent for each of the 



