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Forest Mensuration

Forest Mensuration


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...by 12. The result is the number of feet in the stick per foot of its length. Three to 5 per cent may sometimes be added for contents above the point stated. There are two steps involved in these rules of thumb for board feet: First, a rule or formula is required, which gives an approximation of actual board-foot contents of logs of different sizes. This can only be obtained by rules based on cubic instead of board-foot contents ( 39). Taking a fixed per cent of the contents of all logs, the last rule above quoted reduces to The second step is to get the dimensions of an average log in a tree, thus averaging large and small, or top, butt and middle logs together. Empirical results rather than mathematical soundness has usually been the basis of all such rules of thumb. Practically all these rules of thumb for board feet are based upon the log unit, as might be expected. A more scientific application of a universal rule of thumb is that devised by F. R. Mason (Ref. Rules of Thumb for Volume Determination, Forestry Quarterly, Vol. XIII, 1915, p. 333). This rule is as follows: 5. The volume of a tree of each diameter and height class will correspond closely with the volume as obtained by averaging the scale of the butt and top logs and multiplying by the number of logs, using 16 feet as the standard log length. Mason states that this rule has been in use by Minnesota cruisers. Its superior accuracy is based upon the fact that it conforms to the form quotient of the tree as well as to its diameter and height, by introducing upper diameters at two points. For Douglas fir this rule was 3 per cent below actual scale; for cedar, above 24 inches, 10 to 15 per cent high. For white pine, spruce, yellow pine, larch, lodgepole pine and fir, average results were with...


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Product Details
  • ISBN-13: 9781231796757
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 202
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1231796758
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 372 gr


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