BOARD MEASURE 



143 



Service in various spruce mills of Maine. Some results of 

 this test are given in tabular form. All logs were straight 

 and sound, and exact conditions were as follows: 



Band Mill No. 1, -inch saw kerf, lumber cut just 1 inch 

 thick. Mill run for economy and utmost product of long 

 lumber, giving product of about 40 M daily. 



Band Mill No. 2, same saw kerf. Mill run for speed 

 rather than economy, product being 58 M a day. 



Rotary Mill, ^-inch saw kerf, lumber even inch thick. 



Gang Saw, ^-inch kerf, lumber even inch thick, logs 

 sawed alive or through and through. 



TABLE I. YIELD IN INCH BOARDS OF LOGS 16 FEET 

 LONG AS SAWED IN DIFFERENT MILLS 



