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THE WOODSMAN S HANDBOOK. 



to cover nearly twice the area in a day. In making the field records, 

 therefore, the merchantable height as well as the diameter was 

 recorded in the following form: 



SPC/S - P/A/f. 



FIG. 4. Method of tallying standard logs and diameters. 



Both diameters and heights are judged by the eye, but calipers 

 may be carried, with which to check frequently the measurements. 



The accuracy of this method may be slightly increased by 

 tallying, in a class by themselves, the dimensions of every one of 

 the larger trees, instead of only 1 in 5. 



If 50 per cent of the area is covered, 10 per cent of the total 

 stand is tallied, and the total estimate is found by computing 

 the contents of the recorded trees and multiplying by 10. This 

 result may be modified by a correction factor if it is evident that ' 

 the timber not counted differs yi stand per acre from that estimated. 



