MASKING FOE THINNING. 143 



The relative proportions, are easily remembered, 

 which greatly assist the measurer in arriving at the 

 contents of a tree. The intermediate figures soon also 

 become familiar to the mind when extensively in prac- 

 tice. In making the strap, it is advantageous to mark 

 one side with white paint for measuring peeled timber, 

 when no allowance is made for bark ; thus the side of 

 the square of a tree 3 feet in girth is 9 inches. The 

 other side may be marked with red paint, allowing for 

 bark at the rate of 1 inch to the foot in girth; thus 

 the side of the square of a tree that girths 3 feet is 

 indicated upon the strap 8^ inches, and so on in the 

 same proportion throughout the whole length of the 

 strap. 



