. Forest mensuration. herefore not a direct subdivisionof Management, but a distinct subject preparatory to Management. 6. Absolute versus Relative Accuracy in Mensuration. ForestMensuration attempts to secure as close an approach to mathematicalaccuracy as the conditions of the problem, the use to which the data areput, and the cost of the work will permit. In scaling, the volumes oflogs are determined before sawing, and in timber estimating, the contentsof trees and stands are obtained before felling. But no log rule willgive the exact quantity of lumber which will be sawed from a givenlog,
. Forest mensuration. herefore not a direct subdivisionof Management, but a distinct subject preparatory to Management. 6. Absolute versus Relative Accuracy in Mensuration. ForestMensuration attempts to secure as close an approach to mathematicalaccuracy as the conditions of the problem, the use to which the data areput, and the cost of the work will permit. In scaling, the volumes oflogs are determined before sawing, and in timber estimating, the contentsof trees and stands are obtained before felling. But no log rule willgive the exact quantity of lumber which will be sawed from a givenlog, and no tree volume table can predict the output in boards from a 4 INTRODUCTION TO FOREST MENSURATION given tree, since these results will vary with the methods and conditionsof sawing and of utilization. a si CO o C3 ti Forest PhysiographyDendrologyForest EcologyForest EntomologyWood Technology SilvicultureForest EngineeringLumbering Wood Using IndustriesForest Protection ll >. 0) GeologyBotanyZoologyMechanics / /. to \ a u s ^ 0 ^ I. a 0 C14 a > to cj3 toaa?J a >> 0 & S 2 ^ orestEconoorestHistor ?3 s u b Cl. ^ S3 pliediencesonomicandchnical 0 ?t-t HI a .£1 d d bo ^rj 0 ® «^mH H ffl 0 Again, in estimating timber it is seldom possible to measure everytree, on account of the time and expense involved. For this reason, FOREST SURVEY 5 only an average portion of the stand may be measured. The laws ofaverages, or of sampling are applied to solve nearly every problem inForest Mensuration, in order to bring the cost of the field work withinpractical limits. When Mensuration deals with the growth of trees and stands, andof whole forests, its purpose is to predict what will occur in the bases these predictions upon the results which have occurred in thepast, under conditions judged to he similar to those which will affectthese future stands. The laws of growth of trees, and especially, ofstands composed of great numbers of trees competing with each otherfor efo
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectforestsandforestry
