COMPARISON OF SCALED CUBIC CONTENTS 



37 



TABLE II 



Comparison of Per Cents of Cubic Contents of Cylinders Scaled by Various 

 Log Rules, for Logs 18 Inches in Diameter at Small End, with 2-inch 

 Total Taper 



Cylindrical contents measured inside bark 



Log rule 



Cubic Standards 

 Market or Glens Falls standard 



22-inch standard 



Blodgett or New Hampshire. . . 



Cubic foot — Maine 



Cubic meter— Philippines: 



Short logs 



Long logs 



Basis of measure- 

 ment of cylin- 

 der, in applica- 

 tion of rule 



Cubic Log Rules for Squared 

 Timbers 



Quarter girth or Hoppus 



Inscribed square 



Two-thirds 



Cube rule, or Big Sandy 



Log Rules Expressed in Board 



Feet but Based on Cubic 



Contents 



Constantine 100 



Tatarian 84 . 



Saco River 72 ^ 4 



Derby | 72 . 1 



Square of Three- Fourths j 71.7 



Partridge ' 08. 8 



Blodgett, converted, ratio lOO' 



tolOOOft. B.M ! 



I 



at 

 small 



end. 



Per 

 cent 



100 

 100 



100 



63.4 



50 . 6 



at 

 middle 



Per 

 cent 



100 

 100 



100 



Per cent of scale 

 if measured at 

 other point 



at 

 middle 



56.5 



59.7 



89.7 

 89.7 



at 

 small 

 end 



56,9 



50.8 



89.7 

 75.4 

 65.0 

 64.7 

 64.3 

 61.8 



111.4 

 111.4 



78.5 87.5 



I 



62.9 



Per cent deducted 

 from contents of 

 cylinder to ob- 

 tain contents 

 given in rule — 

 For rules applied 



at 

 small 

 end 









 11.4^ 

 11.4^ 







11.4^ 



12.5 

 36.6 

 37.1 

 43.4 







16.0 

 27.6 

 27.9 



28.3 

 31.2 



33.5 



at 

 middle 



10.3 

 10.3 











10.3 

 



21.5 

 43.1 

 43.4 

 49.2 



10.3 

 24.6 

 35.0 

 35.3 

 35.7 

 38.2 



40.3 



