CRUISING WITH THE AID OF A VOLUME TABLE 51 



PROBLEM 24. (Field and Office.) Cruising with the Aid of a Volume 



Table.* 



ExPLAN.\TiON : The object of this problem is to illustrate a method of cruising a 

 tract of considerable size with volume tables showing values for trees of differ- 

 ent diameters and total heights. 



DiRECTIOX.S: 



A. Equipment Required. 



1 hand compass or Forest Service Compass and Staff. 



1 pair of tree caUpers. 



1 hypsometer. 



1 field notebook with cruising Forms 4 A and B. 



B. Parlies and Organization. 



The same organization as outlined for Problem 23 will be followed in 

 this exercise. 



C. Method of Procedure. 



The estimate will be obtained by running four strips four rods wide 

 through each forty. On each strip the diameters breast high and the 

 total heights of all trees 10 inches and over in diameter will be tallied. 

 The volumes will be obtained by means of the volume tables given in the 

 Appendix or any other tables based on diameters breast high and total 

 heights, applicable to the conditions. 



Part I. Running Strips 



The compassman will pace, run the compass line and at the end of each acre. 

 (4 rods wide by 40 rods long) cruised will see that the cruiser changes the tally 

 sheets. If the object of the work requires a topographic map the compassman 

 will make such a map while the cruiser tallies the trees. If no topographic map is 

 required he need only run the compass line and pace the distances unless the area 

 of the stand be irregular in which case he should plat a diagram to scale on Form I 

 of the field notebook showing the shape of the tract, boundaries of the timber, 

 limits of forest types, location of burns or other features affecting the forest cover. 



The cruiser will tally the diameters breast high and total heights of all trees 

 10 inches and over in diameter. At the end of each acre he will carefully fill out 

 on the reverse side of the tally sheet the acre number, direction of course, section 

 number, etc., which will locate the acre, and he will then change tally sheets. 



Tallying will be done on Form 4 A, using the thirty-foot height classification 

 given on these sheets, i.e., up to 75 feet, 75 to 105, 106 to 135, 136 to 165, 166 to 

 195, 196 to 225, 226 to 255, and from 256 feet up. In case the volume table used 



* As in Problem 23, this exercise will need to be modified if used anywhere except in the 

 Pacific Coast region. The modifications may be noted on the blank page following the 

 problem. 



