329 Forestry Quarterly. 



can profitably be sawed into lumber is six inches at the small 

 end, and since the Forest Service timber sale contracts in this 

 region usually specify that all material down to six inches in 

 the top will be scaled by the Scribner Rule, Decimal C, a volume 

 table which gives accurate results must include scaled material 

 to this minimum size. All log scales were read from an ordinary 

 30" Forest Service Scribner Rule scale stick, after the average 

 diameter had been secured, and the scale was recorded in one 

 of the extra columns, headed "Scrib. Dec. C." If the log was 

 defective, proper deduction was made and the resulting scale 

 recorded in the column, "Defect Scale," which therefore, signifies 

 the scale after the defect, if any, has been deducted from tlie gross 

 scale. 



In this region mine props are utilized to a minimum diameter 

 limit of 5 inches inside bark, and this was usually adhered to 

 in the operations' on which the present data were gathered. The 

 length of the top above the 6-inch point was measured to the 

 nearest foot and recorded as the next section after the last 

 sawlog. The amount of material in the top which was 5" or 

 more in diameter inside bark, was measured and recorded in feet 

 in an extra column, headed "Linear Feet," and on the same line 

 as the total length of the top. 



Under "Remarks" in the right-hand column, notes on the 

 amount of character of any defect or on utilization were entered. 

 Under "Remarks" at the bottom were placed the estimate of 

 the site quality and utilization notes. In volume measurements 

 the "Age" column and the reverse side of the form were not 

 used. A brief and concise forest description was written for 

 each set of measurements collected in a given stand and designated 

 so as to apply to certain tree numbers. An endeavor was made 

 to select trees which were fairly representative of that particular 

 stand. However, it was necessary that measurements be taken 

 in very good and very bad stands as well as in average ones, in 

 order that the entire range of merchantable Lodgepole pine might 

 be represented by the data. 



The "Used Length" is that portion of the tree between the 

 stump and the 6-inch point which has been utilized. The "Mer. 

 (merchantable) Length" is the entire length between these points 

 and may be greater or the same as the "Used Length." The "Clear 



