SCALING. 53 



be scaled separately. Rough averaging of diameters or lengths is 

 not allowed. 



All timber will be scaled by the Scribner "Decimal C" log 

 rule. This rule drops the units of the estimated number of board 

 feet in logs, and gives their volumes, in the nearest number of 

 tens. Thus, the contents of a 16-foot log 12 inches in diameter, 

 which is 79 board feet according to Scribner' s computation, is 

 evened off to 80 and given as 8: the 303 board feet in a 24-inch log 

 12 feet long are rounded off to 300, and appear an 30 in the table. 

 In other words, the rule gives in each case one-tenth of the con- 

 tents of each log, which must be multiplied by 10 whenever the 

 total number of board feet in a log is wanted. When a total 

 scale is desired all that is necessary is to add one cipher to the sum 

 of the numbers read from the scale stick, excepting the contents 

 of 6 and 8 foot logs 6 and 7 inches in diameter. These are given 

 as 0.5, which multiplied by 10, gives 5 feet as their actual contents. 



INSTRUCTIONS TO SCALERS. 



Measure diameters inside the bark. 



Round off the diameter to the nearest inch above or below the 

 actual diameter. 



Make proper deductions for defects in logs. 



Make no deduction for curve or "sweep" in logs over 16 feet 

 long. 



Scale logs over 16 feet long as two or more logs, in lengths not 

 less than 12 feet, when practicable. 



The following table shows how the lengths should be divided 

 when scaling logs 18 to 60 feet long. The number of inches to be 

 added to the diameter at the small end of each log, to cover taper, 

 is placed under each length. 



For example, a 42-foot log 16 inches in diameter at the top would 

 be scaled as 



One 12-foot log with a diameter of 16 inches. 



One 14-foot log with a diameter of 17 inches. 



One 16-foot log with a diameter of 19 inches. 



