38 LOG RULES BASED ON CUBIC CONTENTS 



TABLE II— Continued 



Of the cubic log rules expressed in board feet, the Constantine is frankly a cubic 

 rule, converted from the cubic foot, but based on the small end of log. The' rest 

 are suitable neither for cubic contents nor for board feet, since they do not express 

 the former nor do they measure the latter correctly (Chapter V). 



These rules are all convertible into cubic units or from one to the other, when 

 based on cylinders measured at the same point. 



irD 2 



The formula, Board feet = (1 — C) — L, can be used to obtain the values for anv 



48 J 



of these rules, by substituting for C the per cent given in the last two columns of 

 Table II, e.g. 



