TABLES RELATING TO PARTS III AND IV 273 



VOLUME TABLE No. 17. NORTHERN HARD WOODS (BIRCH, 

 BEECH AND MAPLE) BY THE SCRIBNER RULE 



(Adapted from Bulletin No. 285, U. S. Forest Service, 

 by E. H. Frothingham) 



Based on 800 trees cut in the Lake States scaled from 

 taper measures in logs 16.3 feet long from a stump 1 foot 

 high to top diameters found in actual logging: figures 

 evened by curves. As no allowance was made for crook 

 and defect, considerable discount is necessary in most 

 timber. 



NOTE. Comparison between the values in this table and the preceding 

 shows striking differences, and the text indicates how these arose, from dif- 

 ferences in tree form and soundness, lumbering practice, and methods of re- 

 cording and computing. The cruiser is under obligation before he applies 

 either in practice t9 understand these points, and he will do well to check 

 the table he uses with local practice and on local timber. That done, how- 

 ever, the tables will apply throughout the distribution of the species. 



