52 



BULLETIN" 909, U. S. DEPARTMENT OF AGRICULTURE. 



Because there is a somewhat greater waste in cutting from the 

 sapwood side on account of the " dog board " being all heartwood, 



Sapttfood 



Fig. 7. — Diagrammatic cross sections of two walnut half logs showing how the veneer is 

 sliced by the stay-log rotary process from the sapwood side (above) and heartwood side 

 (below). In both sketches the portion above the upper curved line is trimmed off before 

 a sheet of merchantable size is obtained. That below the lower curved line is the dog 

 board. The part below the dog board in the lower sketch is trimmed off to secure a face 

 for attaching the log to the veneer machine. 



the yield from clear flitches will be on the average somewhat less 

 than it is when the cutting is from the heartwood side. If the heart- 



