152 ENGLISH WOODLANDS 



BA:DC::ba:Dc; assume that ba=--3% feet, 



f>(\ y. ql_ 



then B A - ^ = 35 feet. 



The following table of quarter-girths and 

 lengths facilitates the calculation of contents. 



6 inches quarter-girth is J of length 



' 99 99 99 "3 99 



*tJ 99 99 99 2" 99 



10 2 



XV/ 99 99 99 3 99 



^ 99 99 99 1 99 



1*5 99 99 99 lj 99 



l^J 99 99 99 1"2" 99 



16 If 



T7 9 



1 99 99 99 ^ 99 



99 99 99 2J j, 



21 



99 99 *^ 99 



For example, if a tree has a length of 40 feet 

 and a quarter-girth of 6 inches, the cubic con- 

 tents are of 40 = 10 cubic feet. If the quarter- 

 girth is 8| inches, the cubic contents are 20 cubic 

 feet, and with a quarter-girth of 17 inches the 

 cubic contents are 80 feet double the length. 



Measurement of the cubic contents of the 

 first 12 feet from the ground is a great assistance 

 in ascertaining the cubic contents of a large 

 tree. Mark with a piece of paper or something 

 prominent the top of the first 12 feet and estimate 



