FOREST COMMISSIONER'S REPORT. 



89 



^£C. M 



Sejs »?. 



6'ic. 2. 



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The upright diagram represents the tree with the sections in 

 place. These are numbered in agreement with the numbers on the 

 schedule ; 1 is the length of the log, the sub-number in each case 

 corresponding with the number of a log or section. The circular 

 diagram represents a section. The diameter is drawn and lettered 

 d ; y is the thickness of the outer ten rings. The area of these ten 

 rings in the section is called A and equals the area of the circle 

 whose diameter is d minus the circle with diameter d — 2 y. Sub- 

 numbers are used with each term — that is Ao is the area of the ring 

 in section 2 etc. 



