FULL 8TEM CUBIC FOOT VOLUME TABLE 



31 



9. Connect the consecutive average points by fine straight hnes. 



10. Draw a free-hand curve, giving weight to the various points according 



to the number of trees represented, and smooth off the curve with a 

 si)hne or other curve rule. 



11. Read off from this curve the volumes for whole inches as indicated, 



and tabulate in one corner of the sheet of cross-section paper. 



12. Label the exercise and indicate the species, forest type, locality, total 



number of trees used, and date. 



D. References.— lumbers 31, 32 and 36. 



PROBLEM 17. (Office.) The Construction of a Full Stem Cubic Foot 

 Volume Table Based on D.B.H. and Total Heights. 



Method. — Averaging the values first and then plotting the averaged values. 

 For this problem diameters will be taken in 2-inch classes, and heights in 

 20-foot classes. (Ordinarily heights are taken in 10- or 16-foot classes.) 



Directions. 



A. Data Required. — Determine first just what field measurements are neces- 



sary for this problem. They differ slightly from those of Problem 16. 

 Ask the instructor if you are right before proceeding. 



B. Use Data Series I, or the data collected in the field in Problem 6. 



C. Method of Procedure. 



I. Tabulation. 

 1 . Prepare a blank form for tabulation like the following : 



Each diameter class will be imderstood to include all trees from .1 

 over the whole inch of one diameter to the whole inch of the second 

 higher diameter inclusive; i.e., the 12-inch class includes all trees 



