FOREST, FISH AND GAME COMMISSION. 



79 



MEAN SAMPLE TREE METHOD. 





THE CALIPEREE 



TREES. 



THE STAND. 



THE SAMPLE TREE. 



CO 



w 



SPECIES. 



DIAM- 

 ETER. 



NO. OF 

 TREES. 



SUM OF 

 CROSS 

 AREAS. 



NO. OF 

 TREES. 



CROSS 

 AREA. 



CROSS 

 AREA. 



DIAMETER. 







MEASURED AT BREAST 

 HEIGHT. 



Deo 





Inches. 



22 



Sq.ft. 

 7.68 



-, 



Sq.ft. 



Sq. ft. 



Inches. 







9 



77 



34.02 















lO 



97 



52.90 















II 



162 



106.92 















12 



40 



3142 















13 



100 



92.18 















14 



115 



122.94 















15 



88 



107.99 













White Pine, 



16 



17 

 18 



19 

 20 

 21 

 22 



23 

 24 



^ 25 



160 

 182 

 45 

 67 

 88 

 no 

 86 

 22 

 14 

 85 



223.41 

 286.89 



79-52 

 131.92 

 191.99 



264.58 

 227.02 



63-47 

 43-98 

 289.75 - 



> 1,560 



2,358.58 



I-51 



16.7 



6 







1,560 



2,358.58 







i 





2,358.58 sq. ft. -^ 1,560= 1. 51 sq. ft. = cross area of sample tree. 



The diameter corresponding to a cros^ area of 1.56 sq. ft. is 16.7 in. 



Diameters are calculated from cross areas and cross areas from diameters with 

 the help of a table of areas of circles referred to on page 75. The table informs us 

 that the diameter corresponding to a cross area of 1.5 1 square feet is 16.7 inches and 

 from the height measurements it is found that white pine trees 16.7 inches in 

 diameter have an average height of about 100 feet. 



