32 



SELLING WOODLOT PRODUCTS ON MICHIGAN FARMS. 

 TABLE 7.— DOYLE LOG RULE. 



Diameter inside bark. 

 Email end of log. 



Inches. 



6, 

 7, 

 8, 

 9 

 10 



11 



12, 

 13 

 14 

 15 



16 

 17 

 18 

 19 

 20 



21, 

 22, 

 23, 

 24, 

 25, 



26, 

 27, 

 28, 

 29. 

 30, 



31. 

 32, 

 33. 

 34. 

 35. 



36. 

 37, 

 38. 

 39, 

 40, 



41, 



42, 

 43. 

 44, 



Length of log, in feet. 



Contents in board feet. 



5,0 



11.3 



20 



31 



45 



61 

 80 

 101 

 125 

 161 



180 

 211 

 245 

 281 

 320 



361 

 405 

 461 

 600 

 551 



606 

 661 

 720 

 781 

 845 



911 



980 



1,051 



1,125 



1,201 



1,280 

 1,361 

 1,445 

 1,531 

 1,620 



1,711 

 1,805 

 1,901 

 2,000 



The ordinary way of using these rules is by means of "scale sticks," 

 which are thin strips of hickory, with the log volumes in board feet 

 corresponding to different lengths of log burned into the two sides of 

 the stick. In scaling, the stick is laid across the average diameter of 

 the log at its small end inside the bark, and the figure nearest the bark 

 which corresponds to the estimated or measured log length is the con- 

 tents in board feet according to the particular rule used. Scale sticks 

 for either the Scribner or the Doyle rule can be purchased for $1.50 

 or $2. 



While the use of scale sticks makes it possible to read off the volumes 

 directly and thus save some time in scaling, it is by no means necessary 

 to have one. It is a simple matter to measure the average inside bark 

 diameter with an ordinary rule, and refer to the tables here given for 

 the corresponding volume. In measuring the diameters, fractions of an 



