170 



CONSTRUCTION OP STANDARD VOLUME TABLES 



of harmonized curves of volume based on diameter is shown in Fig. 

 28 with height class of the trees in each curve indicated. 



From this set of curves a table can be read, whose form is similar 

 to that of Table XXVII, but whose volumes increase regularly with 



9 



10 



n 



12 



13 



"15 IF w W 

 Diameter,. laches 



18 



19 20 



Fig. 28. — Curves of volume based on diameter for separate height classes, plotted 

 from original averages in Table XXVII. 



diameter, and whose values are interpolated to even inch classes from 

 the averages of the original table. 



141. Harmonized Curves Based on Heights. But this table is 

 not necessarily in final form, for the variations caused by height must 

 also be harmonized. The first set of values has been made regular 



