MEASUREMENT OF TIMBER. 



fio.Z. 



diameter is equal to its diameter at base is as 1 to 3, 

 and its form figure J or '33; but as we take diameter 

 at breast-high, the true form 

 figure will range from *35to *40. 



Fig. 2 is the extreme type 

 of an oak grown in free space, 

 and with its cubic contents 

 equal to those of a cylinder ; 

 and trees ranging between 

 these two extremes would 

 be classed under the form 

 figures -40, -50, &c., to 1-00. 



With these data, height, diameter at base, 

 and form figure, we arrive at the contents of a 

 tree by multiplying the area at base by the height, 

 and the product by the form figure. For example, 

 to get at the contents of a tree 2 feet diameter at 

 base, 70 feet high, and with a form figure of '60, we 

 say2 2 x *7854 x 70 x '60 = 132 nearly, cubic con- 

 tents of the tree. The form figure is usually based 

 on the marketable contents of the tree, including 

 branches, and is thus arrived at for a forest about 

 to be valued : 



Fell half-a-dozen typical specimens, including 

 those of greater and those of smaller diameters ; 

 then taking each tree separately, measure the 

 trunk, or such part of it as is a right geometrical 

 figure, and cut up and weigh all the crooked parts 



