. Cyclopedia of farm crops. Farm produce; Agriculture. 338 FORESTS FORESTS brush in some cases is burned to avoid uncon- trollable fires. This should be done more fre- quently. The Forest Service has made investiga- tions along this line and has found that in a cer-. ^^^^iS^l^f^Pi Fig. 481 Sorting logs at market Northern Michigan feet. By this rule, if a log is twenty inches in diameter and ten feet long, it contains 160 board feet. The Doyle rule gives less than Scribner's in logs up to about twenty-nine inches, and more than Scribner's above that. Cost. Other things being equal, it costs as
. Cyclopedia of farm crops. Farm produce; Agriculture. 338 FORESTS FORESTS brush in some cases is burned to avoid uncon- trollable fires. This should be done more fre- quently. The Forest Service has made investiga- tions along this line and has found that in a cer-. ^^^^iS^l^f^Pi Fig. 481 Sorting logs at market Northern Michigan feet. By this rule, if a log is twenty inches in diameter and ten feet long, it contains 160 board feet. The Doyle rule gives less than Scribner's in logs up to about twenty-nine inches, and more than Scribner's above that. Cost. Other things being equal, it costs as much to harvest in- ferior classes of timber, like beech and ma- ple, as it does walnut and hickory, and more than pine and cedar; hence the cost of harvest will be higher for the inferior timbers as com- pared with their value. The cost of lay- ing the lumber tain locality in Minnesota the of burning the brush from pine timber was ten cents per thou- sand feet of lumber. In other places it would be more or less, depending on conditions. Formerly, great vertical cylinders called , used for burning waste, were conspicuous objects at a large mill (Fig. 480), but present economy in some places leaves these as monuments to mark a stage in the progress in the economical development of timber harvesting. On small timber lots there need be no waste except the small brush, which should be left scattered so that it will decay more readily if it is not convenient to burn it. Valuation. In disposing of a piece of timber, the owner should know by what rule the tim- ber is to be scaled. There are some fifty log rules ; any one of them may be used, but comparatively few of them are in common use. One rule may be used in one locality and a difi'erent one in an- other locality. Theoretically, they should agree, because no rule can change the volume of a log. Logs are usually scaled at the small end inside the bark, but the practice of scaling in the middle prevails in some plac
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