MEASUREMENT 149 



The quarter-girth over bark of felled timber can 

 be accurately measured. If the timber has been 

 sold at so much a foot felled, it is a useful plan for 

 both parties to agree to measure over bark and to 

 find the volume under bark by a fixed deduction 

 from the total of the measurements over bark. 



In a normal larch wood, where there are no 

 old trees, a reduction of 12| per cent, from the 

 total of the cubic feet over bark will represent 

 the amount of cubic feet under bark. Should 

 either party doubt the fairness of a reduction 

 of 12 J per cent, a certain number of average 

 stems can be measured over bark and then again 

 after a ring of bark has been removed, and the 

 difference between the cubic contents of the two 

 measurements taken as the allowance to be made. 



In normal oak trees grown in a wood an 

 allowance for bark of 1 inch, or in some cases 

 Ij inches, in every 12 inches of quarter-girth 

 is sufficient. The taper of oak trees can only be 

 estimated after inspection of the tree, for individual 

 differences of oak trees are much greater than in 

 the case of larch grown closely in a wood. 



Some measurers make an allowance, in stand- 

 ing oak timber, for bark and taper combined 

 of 2i inches in every 12 inches of quarter-girth. 

 If the tree is again measured after it has been 



