52 
BULLETIN 909, U. S. DEPABTMEXT OE AGRICULTURE. 
Because there is a somewhat greater waste in cutting from the 
sap wood side on account of the " dog board " being all heartwood, 
'Sopwood 
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- 
