DISCUSSION OF LOG RULES. 



might be used, or to the character of the timber sawed. It is unaffected 

 by taper, normal crook, width of saw-kerf and excessive taper in small 

 logs, and such corrections can not be properly made due to the diagram 



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method used in first constructing the rule. Fig. 1 indicates the follow- 

 ing formula: (.048D 2 2) L = B. M. = volume in board feet, which 

 very closely fits this rule as shown in Fig. 2. 



Small logs will invariably over-run this scale, due to the constant "2" 

 shown by the formula. Intermediate logs will hold up the scale, fall 

 below, or go above, largely depending upon the width of saw-kerf and 



