SECTION VII— DETERxMINATION OF THE CONTENTS OF STANDS 



Explanation: This section has been outhned especially with reference to 

 Pacific Coast timber. Very shght modifications to suit the needs of the 

 different sections of the country will, however, make it available for use 

 anywhere. The blank pages at the end of the problems may be used for 

 noting such modifications. The work has been arranged to illustrate several 

 methods of cruising, so as to allow the student to compare them, and to give 

 him practice in estimating the total volumes of trees and stands by ocular 

 estimate. 



PROBLEM 22. (Field.) Obtaining the Contents of a Small Tract of 

 Timber by Different Methods. 



Directions: 



A. Parties. — Men will be organized in two-man crews, each man alternating 



as tallyman and as cruiser. 



B. Instruments. 



1 pair tree cahpers. 



1 compass. 



1 hypsometer. 



1 field notebook, supplied with Forms 1, 3 A, B and 4 A, B. 



C. Method of Procedure. 



1. Select a representative area in the stand, and with the aid of the 



compass and paced distances run out a square acre (208.7 feet on a 

 side) . 



2. Secure the volume of the acre tract by the following five methods: 



(a) Ocular estimate. 



ih) Commercial cruising method. 



{c) D.B.H. volume table method. 



{(I) Diameter-height volume tabic method. 



{c) Spaulding rule method. 



These methods should be carried out in the following way: Each of 



these methods, except (c) and {d) which may be combined in the 



field, should be worked out separately in the order given, and the 



volume computed on the ground before proceeding with the next 



45 



