. Forest mensuration. and top istaken. If only one end is affected, the diameter of the defective portion Fig. 14.—The boardslost are measured in-side the smaller in-scribed circle repre-senting the top diam-eter. Three boardsare affected, 4 inches,6 inches, and 8 6-inch board isdeducted. If the min-imum width of boardutilized is 4 inches, a4-inch strip is de-ducted from the 8-inchboard. But the 4-inchstrip on the marginwas not scaled in theoriginal diagram andshould be omitted, asconstituting over-runby this log rule. Inordinary scaling prac-tice this distinctionwould probably beov
. Forest mensuration. and top istaken. If only one end is affected, the diameter of the defective portion Fig. 14.—The boardslost are measured in-side the smaller in-scribed circle repre-senting the top diam-eter. Three boardsare affected, 4 inches,6 inches, and 8 6-inch board isdeducted. If the min-imum width of boardutilized is 4 inches, a4-inch strip is de-ducted from the 8-inchboard. But the 4-inchstrip on the marginwas not scaled in theoriginal diagram andshould be omitted, asconstituting over-runby this log rule. Inordinary scaling prac-tice this distinctionwould probably beoverlooked as toogreat a refinement. INTERIOR DEFECTS 109 is scaled at that point and its length judged by experience gained inthe locality by the butting off of defective logs; , a log 20 inches indiameter at the top end, 16 feet long, with a center rot measuring 3 inchesat top and 15 inches at butt, will lose the equivalent of a 15-inch butt rot,and not a 3-inch piece. Should the log be 20 feet long, the average. Fig. IS.^When the minimum length of board is 8 feet this log will scale one-half of the contents of a 16-foot log. But with a minimum length board of10 feet the log according to common practice will scale nothing and be culled. dimension of this rot, or 9 inches, would be taken, according to theabove arbitrary rule of scaling. But if the rot is present only in thebutt, the 15-inch measurement would apply to that portion of tl\e logwhich was judged to be affected, provided the length of the remainingsound portion equaled the minimum length of board prescribed.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
