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A MANUAL OF FORESTRY 



by one man. In principle it does not differ from the method 

 just described. The estimator secures his distances by pacing, 

 guiding his course by a pocket compass. Instead of measuring 

 the timber in a continuous strip he takes measurements only at 

 certain points, as at the end of every quarter mile. At these 

 points circular plots are laid off as described under B. In open 

 forest and with mature timber it soon becomes possible to locate 

 the boundaries of the plot by the eye. The trees are either 



Fig. 61. Estimating timber by use of the strip method. 



calipered and the volume of the types ascertained, as in the val- 

 uation survey method, or after sufficient practice the volume of 

 each tree can be estimated and tallied. After the volumes of 

 all the sample plots in a type have been found, the average volume 

 per acre is obtained and this is multiplied by the number of acres 

 in the type, as secured from the map. 



THE MONEY VALUE OF STANDING TIMBER. 



After the amount of standing timber or wood on a given tract 

 has been estimated, the final object usually is to determine its 

 money value. 



