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CUBIC MEASURE. 45 



/VIETHOD OF CUBING LOGS BY THE MEASUREMENT 

 OF THE LENGTH AND END DIAMETERS. 



By this method the diameters of the t\\'o ends of the log and its 

 length are measmed. 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. 



'n. which Fis the volume of the log in cubic feet, B and h are the 



xreas in square feet that correspond to the diameters of the two ends, 



tind L is the length in feet. 



Example: 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 : 



,, 1.396+1.767 ^ , . , 



F= ^ X 12= 18.97 cubic feet. 



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 ca logs piled on a skidway. 



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