CHAPTER VII. 



MEASUREMENT OF TIMBER. 



Prostrate logs. The English method, and that 

 usually adopted in this country to determine the 

 cubic contents of a log, is to multiply the length 

 by the square of the quarter girth at the middle. 

 This method is erroneous with round timber, from 

 the fact that the square of the quarter girth is 

 less than the real area of section, which is deter- 

 mined by multiply ing the square 

 of the diameter by '7854. In 

 the accompanying diagram, the 

 side of the square is the quarter 

 girth of the circle, and it will 

 be seen at a glance that the 

 circle has a much greater super- 

 ficies. The difference is, in fact, about 22 per cent., 

 a log 12 inches in diameter having a superficies 

 of 113 inches, while the square of the quarter 

 girth gives 88-J- inches only. This method is 

 nevertheless a very fair one for measuring timber 

 of not more than three feet girth, as the outer 



