20 



TABLE No. 7. Graded Mill Tally Log Rule for Beech 

 Continued. 

 12-Foot Logs. 



14-Foot Logs. 



For yellow birch a comparison was made of the contents of nondefective butt 

 logs, nondefective top logs, and the average of all logs. This showed that the 

 difference in volume due both to defect and position in the tree was negligible 

 for logs under 12 inches in diameter at the small end, while for logs 12 inches 

 and over in diameter it amounted to about 9 per cent of the volume of the sound 

 butt logs. It was less than 6 per cent for logs from 12 to 16 inches in diameter, 

 and a little less than 11 per cent for 21 to 24 inch logs. The difference due to 

 position in the tree between sound normal top and butt logs varied from about 

 3 per cent of the volume of the 12 to 16 inch butt logs to about 10 per cent of the 

 21 to 24 inch butt logs. 



In the table for yellow birch it will be noted that the 10-foot logs show a greater 

 proportion of the poorer grades than do the longer logs. This is particularly 

 noticeable in the No. 1 common red and the No. 2 common grades, and is due 

 especially to the fact that the majority of the 10-foot logs were top logs and hence 

 knotty and of inferior quality. 



