CUBIC CONTENTS OF SQUARE TIMBER 



219 



The two-thirds rule. 



In the Two-thirds Rule the diameter of the log is taken at its middle 

 point, or the diameters of the two ends of the log are averaged. The 

 diameter of the log is reduced one-third to allow for slab, and the re- 

 maining two-thirds is taken as the width of the square piece which may 

 be hewed or sawed out of the log. The cubic contents of the squared 

 log are then obtained by squaring this width and multiplying by the 

 length of the log. 



Square timber cut from round logs (in cubic feet) 

 (Inscribed-Square Rule) 



