TIMBER ESTIMATING. 



63 



The figures are tabulated in a form similar to this : 



Volume Table by Diameters and Number of Logs. 

 Length op Standard Log, Feet. 



[Based on the measurement of trees.] 



Diameter 

 breast- 

 high. 



One-log 

 ■ trees. 



One and 

 one-half 

 log trees. 



Two-log 

 trees. 



Two and 

 one-half 

 log trees. 



Inches. 



-Board feet. 



Board feet. 



Board feet. 



Board feet. 



!!♦ 



The great objection to ihis method is that trees are not always 

 cut into logs of the same length. Only seldom, even with very 

 tall trees, are all logs of equal length. A tall white pine may, for 

 example, yield three 16-foot logs and one 12-foot log. If the 

 volume tables are based on 16-foot logs, an inaccurate estimate 

 would result if this were classed as a four-log tree, though this 

 objection is largely obviated by the inclusion of half logs. 



VOLUME TABLES BY DIAMETER AND TREE CLASSES. 



Tables for trees of different diameters and classes are designed 

 for use in very irregular forests where the trees have grown under 

 , Varying conditions of density and form of the stand. Such tables 

 are useful particularly in estimating cord w^ood in second growth 

 hardwood forests. Volume tables based on diameter alone are not 

 accurate for cord-wood work, while those which give separately the 

 volume of the trees with large crowns, those with medium crowns, 

 and with small, give very good results. 



VOLUME TABLES BY DIAMETER AND HEIGHT. 



The most accurate volume tables are usually considered to be 

 those calculated according to diameters and heights. The Euro- 

 pean volume tables are based on this principle and are used with 

 "satisfactory results, even where considerable accuracy is required. 



