
VOLUME TABLES. , 107 
bark on, being taken into account. This value was then divided 
by the product of the height of the tree in feet and the number of 
square feet in the circle corresponding to the diameter of the tree. 
The form factors of trees of the same diameters were then aver- 
aged as shown in the second column of the table on page 108. 
The volume table was then constructed by these form factors for 
trees of different diameters and heights in the following way: The 
area of the circle corresponding to the diameter (10) was multi- 
plied by the height (65) and the product multipled by the form 
factor for 10 inches, namely, 0.508. The result was 18 cubic feet. 
The same calculation was made for the heights 70, 75, 80, and 85 
feet, using the same area and form factor. Then the volumes for 
11-inch trees were calculated in the same manner for different 
heights, using the form factor 0.512. The same method was used 
for other diameters and heights until the table shown on page 108 
was completed. 
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