. Forest mensuration. 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 Fig. 16.—Ce
. Forest mensuration. 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 Fig. 16.—Center rot extending through log. Effect of length of log in determiningthe diameter of the portion to be culled. The scale of this log, if sound, would be 280 board feet, Scribner Decimal Crule. The deduction for a rotten butt 15 inches in diameter and 16 feet longis 228 board feet, residue 52 board feet or per cent of sound scale. Thelog is a cull. The average w dth of rim left to be scaled after projecting thearea of the rotten butt upon the top end, is 2^ inches, or less than minimumwidth of board, and not the actual measurement of sound wood at either the topor the butt. If this log is 20 feet long, , longer than a prescribed maximum length of16 feet, the diameter of this rot is averaged at 9 inches. The 20-foot log, 20 mchesin diameter scales 350 board feet. The 9-inch measurement is applied to theentire length of log, and the deduction is 111 board feet. The net scale is 240board feetj or per cent of total sound scale. Such a log is merchantable. 110 TH
Size: 2271px × 1100px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
