468 SELLING LUMBER 



maximum knot lj^". Shall not have in Volume 2 sound 

 knots greater in diameter than one-half the width of the face on 

 which they appear maximum knot 3 inches. 



The aggregate diameter of all knots within the center half 

 of the length of any face shall not exceed the width of that face. 



The diameter of a knot on the narrow or horizontal face of 

 a beam is to be taken as its projection on a line perpendicular to 

 the edge of the timber. On the wide or vertical face, the small- 

 est dimension of a knot is to be taken as its diameter. 

 Restrictions on Knots in Columns 



4. Shall not have sound knots greater in diameter than 

 one-third the least width of the column maximum knots 4 

 inches. 



Restrictions on Shakes and Checks In Beams 



5. Round or ring shakes shall not occupy, at either end of 

 a timber, more than one-fourth the width of green material, nor 

 more than one-third the width of seasoned material. 



Any combination of checks and shakes which would reduce 

 the strength to a greater extent than the allowable round-shakes 

 will not be permitted. Shakes shall not show on the faces of 

 either green or seasoned timber. 



Restrictions on Cross Grain in Beams 



6. Shall not have diagonal grain* with slope greater than 

 one in twenty in Volume 1. 



Volume 5 



l^olume 1 



/2 Jengffc 



ABBREVIATIONS OF TIMBER GRADES. 



For the purpose of branding timbers with the names of the 

 Grades it is recommended that the following abbreviations be 

 used: 



SQ EDG-SD Square Edge and Sound. 



NO 1 COM No. 1 Common . 



MERCH Merchantable. 



SEL STRUC Select Structural. 



