MEASUREMENT OF LOGS AND OTHER FOREST PRODUCTS II3 



This rule is used in Northern New York and is regarded favor- 

 ably for the measurement of pulpwood. 



TJie New Hampsliire or Blodgett Rule} — This rule is based on 

 a cubic foot having an arbitrary value equal to i .4 English cubic 

 feet. The unit is a log section 16 inches in diameter and i foot 

 in length. The formula for determining the contents of a log 

 of a given diameter and length is 



16- 



in which V is the volume in cubic feet, D the diameter in inches 

 and L the length in feet. 



It is more satisfactory for pulpwood measurement than for 

 board feet because small logs are overvalued and large logs under- 

 valued. When converting the results into board measure, 115 

 cubic feet are assumed to be equal to 1000 board feet when the 

 diameter is taken at the middle of the log, and 106 cubic feet 

 when the diameter is taken at the small end. It is impossible, 

 however, to convert a volume measure into board feet by means 

 of a constant factor because of the wide variation in the relation 

 between volume and board feet when logs of different diameters 

 and lengths are considered.- 



The above rule is commonly used for spruce in Maine, New 

 Hampshire and Vermont. 



Gohel Cube Rule. — This is sometimes called the Big Sandy 

 rule, and is largely used for scahng logs along the Ohio River and 

 tributaries near the Big Sandy River. 



The unit is a log section 18 inches in diameter and i foot long, 

 which is assumed to be the smallest that will cube 12 inches. 



The formula is 



^ A copy of this rule is given in the Appendix. 



2 For a detailed discussion of this subject see The Log Scale in Theory and 

 Practice, by H. D. Tiemann, Proceedings of the Society of American Foresters, 

 Vol. v., No. I, pp. 18-58; and The Standardizing of Log Measures, by E. A. 

 Ziegler, Proc. Soc. of Am. For., Vol. IV, No. 2, pp. 172-184. 



