392 Forestry Quarterly. 



proximately 30%. While leaving some things to be desired in 

 the way of equipment and efficiency, the operation was typical 

 of much of the work being done by the portable saw-mills in 

 the state. 



The number of logs scaled and measured was 62, of which 

 ^4 were White Pine, 21 Hemlock, and 7 hardwoods. They 

 .anged in size from 8 to 16 feet in length, and from 6 to 28 inches 

 in diameter. The smallest log scaled and sawed was 8 feet long 

 md 6 inches in diameter. The largest log scaled and sawed was 

 iO feet long and 28 inches in diameter. Each log was scaled by 

 both the "Universal" Rule and the Scribner Rule, and a tally 

 kept of the actual product, measured as it came from the saw. 

 The logs were divided into seven groups, based on the amount 

 of lumber indicated in the scale, as follows : Group I, included 

 all logs scaling from i to 50 board feet; Group II, included all 

 logs scaling from 51 to 100 board feet; Group III, included all 

 logs scaling from loi to 150 board feet; and so on, Group VII, 

 including all logs scaling more than 300 board feet. (Table 2 

 shows the number of logs in each group.) 



Table i is a summary of the results, showing only the amount 

 of the over-run in board feet, and expressed as a percentage. 

 This table shows the "Universal" rule to approach quite closely 

 to the actual mill cut. Table 2 shows in more detail, just how 

 the over-run was distributed, according to the size of the log. 

 This Table is very instructive in respect to the fact that the 

 greatest percentage of over-run, in both rules, occurs in the 

 logs of small diameters. This would indicate that the rules are 

 inaccurate for the very small logs, and since in any "run" of logs 

 there must always be more small ones than large ones, this ten- 

 dency of log rules to undervalue the small logs should be re- 

 membered. In the larger sizes, particularly from 16 inches in 

 diameter to 26 inches in diameter, the differences noted are not 

 so great. In this connection, it is interesting to note that a 

 sound log 10 feet long, and 28 inches in diameter, scaled 364 

 board feet by the "Universal" Rule, 360 board feet by the Scrib- 

 ner Rule, and the measured lumber from this log amounted to 

 just 364 board feet. It would seem, therefore, that our log rules, 

 — most of them — are not liberal enough with the small logs, and 

 in these days of close utilization, the small logs may often count 

 for a good deal, in the aggregate. 



