CUBIC MEASURE. 45 
METHOD OF CUBING LOGS BY THE MEASUREMENT 
OF THE LENGTH AND END DIAMETERS. 
By this method the diameters of the two ends of the log and its 
length are measured. The volume is obtained by multiplying the 
| average of the areas of circles that correspond to the end diameters 
| by the length. Expressed as a formula: 
a 
in which V is the volume of the log in cubic feet, B and b are the 
areas in square feet that correspond to the diameters of the two ends, 
and L is the length in feet. 
ExaAmMpPLe: A log is 12 feet long and the diameters at the ends are 
16 and 18 inches. The areas that correspond to the end diameters 
are found in a table of circular areas, and used in the formula, as 
follows: 
yal seer tl 767°19—-18.97 cubic feet. 
2 
This method requires one more measurement than the previous and 
is therefore not as rapid for ordinary work in commercial scaling. 
It is, however, a very convenient formula for determining the con- 
tents of logs where it is not possible to take the measurement at the 
middle, as on logs piled on a skidway. 
