PLANTATIONS IN CALIFORNIA. 



11 



The Doyle rule is in common use and is more generally employed 

 than any other rule. It is very unfair to small logs, as may be seen 

 from the above table. 



The Doyle and Scribner rule is a combination of the two rules after 

 which it is named, and combines the unfairness of both. For diam- 

 eters less than 28 inches it is identical with the Doyle rule, and for 

 diameters of 28 inches or over it is the same as the Scribner rule. 



The following description of the Scribner rule is taken from page 

 32 of "The Woodsman's Handbook," Bulletin 36 of the Forest Service: 



THE SCRIBNEE RULE. This is the oldest log scale now in general use 



The rule was based on computations derived from diagrams drawn to show the num- 

 ber of inch boards that can be sawed from logs of different sizes after allowing for 

 waste. The contents of these boards were then calculated and the table built up in 

 this way. Sometimes the Scribner rule is converted into what is known as the 

 Scribner decimal rule by dropping the units and rounding the values to the nearest 

 tens. 



Table II, showing the volume of trees expressed in board feet, does 

 not include the volume of the tops too small to scale as lumber. This 

 is given in Table IV, which shows the volume of the part of the tree 

 between points where it is 5.5 inches and 2.0 inches in diameter inside 

 the bark. 



TABLE IV. Volume of Merchantable Tops. Blue Gum (Eucalyptus globulus). 

 Seedlings and Sprouts. 



Detailed descriptions and yield tables of individual groves are given 

 in the following pages: 



DEC 3 1914 



Division of Forestry 

 University of California 



