Solid Wood Products 



2661 



LOG A 



12-INCH 



DIAMETER 



CIRCULAR 



NO SWEEP 



USABLE 

 AREA 



LOG B 



12-INCH 



DIAMETER 



IRREGULAR 



6-INCH 

 SWEEP 



I USABLE 

 „ I *- AREA 



FORMULA TO DETERMINE 

 RETRIEVABLE CANT SIZE 

 FROM ELLIPSE^ 



Y = B /I- 



X2 



WHERE 



A = MAJOR ELLIPSE AXIS (lO") 

 B=MINOR ELLIPSE AXIS (7") 

 X = CANT WIDTH 

 Y = CANT HEIGHT 



SOLUTION IF A 5-INCH-WIDE i 

 TIMBER IS DESIRED: I 



Y=7/l- 



25 

 100 



Y=7 



75 

 100 



Y = 7x.87 



Y = 6 



Figure 22-51. — (Top) Effect of sweep and shape on the portion of the log usable for 

 manufacture of timbers. (Bottom) Method for computing maximum retrievable timber 

 size. (Drawing after Garrett 1970.) 



