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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ...-----= the increment for one year t n and let p = the rate per cent. Graves, H. S.: "Forest Mensuration," page 295. t Although this is, strictly speaking, the periodic annual increment, it is frequently regarded as the current annual increment. See definitions, and explanation of this apparent inconsistency on page 102. Then, depending on whether V or v be considered the base, or principal, two formulae are developed as follows: V: = i00:, n whence p = i00 yy (i) V-v v: = i00: p, Difference of opinion as to which of these two formulae is to be preferred, led to the derivation of a third described in the next article. 68. Pressler's Formula.--Since it might be argued that either V or v could be used as the base (although in most interest calculations, it would be customary to regard v as the principal) Pressler developed a formula in which the mean of the two quantities, V and v, is used as follows: V + v V-i:--.--= i0o: 2 n whence p = Tv) As a matter of fact, this formula (3) is regarded as yielding the most satisfactory results. If the length of time required to grow from one inch-class (d.b.h.) to the next above it be known, then the figures in any carefully constructed, reliable volume table may be used for the corresponding values of V and v, respectively, in a practical appb'cation. M. R. Pressler, 1815-1886. Contributed largely to that part of forestry dealing with mathematics. 69. Schneider's Formula.--By an ingenious application of the formula for the volume of a tree in which the form factor F is used Schneider developed a formula which is extremely simple, and gives fairly good results when applied to trees in which the height-growth is practically at a stand-still, i.e., in mature trees. The formula is as follows: in...
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