8 STATE BOARD OF FORESTRY. 



taken for the diameter. Where there are any known defects, the 

 amount to be deducted should be agreed upon by the buyer and the 

 seller, and no fractions of an inch to be taken into the measurement. 

 "In the foregoing table I have varied the size of the slab in 

 proportion to the size of the log, and have arranged it more particu- 

 larly for large logs by taking them in sections of twelve feet and 

 carrying the table up to 96" in diameter. As there has never been 

 any in use for scaling over 44", it has been my purpose to furnish 

 a table for the measuring of logs that can be implicitly relied upon 

 for correctness by both the buyer and the seller; and to do so, I 

 have spared no pains to render it perfect." 



This rule has been very carefully prepared, and all values given are 

 very consistent with the principles upon which it is constructed. These 

 principles are clearly shown in the graphic analysis made of the rule 

 in Fig. 1. They are as follows: (a) The sawdust allowance varies 



AREA INSIDE BARK SMALL END SQ. FT 



FIG. 1. A graphic analysis of the Spaulding Log Rule, based upon area in square 

 feet inside bark at small end of logs. This diagram shows the following: (a) Top 

 curve, total contents in board feet of logs of different diameters 16' long with no 

 allowance made for taper. (&) Curve "k," volume in board feet remaining after 18% 

 of the total volume has been allowed for sawdust (this allowance is about right for 

 \" saw-kerf), (c) Curve passing through origin and drawn parallel to bottom curve, 

 (d) Bottom curve located by plotting volumes in board feet for 16' logs of even 

 inches in diameter inside bark, as given by the Spaulding Log Rule. The formula 

 indicated by this analysis is as follows: (.048D 2 2)L = B. M. = volume in board feet. 



directly with the volume, (b) Slab allowance varies directly as the 

 volume plus a constant, (c) No allowance made for taper, (d) No 

 allowance made for normal crook, (e) Total waste allowance remains 

 constant, regardless of the width of saw-kerf. 



The big disadvantage of such a rule lies in the fact that it is not 

 flexible to conditions existing at mills in different localities where it 



