50 
BULLETIN 909, TJ. S. DEPARTMENT OF AGRICULTURE. 
of wood. Such highly figured pieces as burls are usually cut one- 
thirtieth inch thick. There seems to be a tendency on the part of 
panel makers to use thicker veneer of about one-twentieth inch. 
Although this veneer costs more, the makers figure that it is more 
profitable in the end; for with the thicker veneer almost no waste 
results from the rejection of panels that have been sanded through. 
Furthermore, the panels may be sanded more rapidly, and this is a 
particular advantage on account of the present high cost of labor. 
One-twentieth inch was formerly the common thickness for sliced 
veneer, but the thickness has been reduced, as walnut has become more 
scarce and higher in price. Sawed walnut veneer is usually one- 
eighth or one-sixteenth inch thick. Figured stock is usually sawed 
one -sixteenth inch thick. 
Yield by different methods. — Exact data are difficult to obtain on 
the yield of veneer from logs of different sizes, because the different 
processes are varied to suit each log. Moreover, there are wide dif- 
ferences in the quality of different logs. Average yields may be 
calculated, however, from practically clear logs, with deductions of 
the average amount of waste in that part of the log from which, in 
commercial practice, merchantable veneer is produced. Table 18 
gives in terms of veneer one twenty-eighth inch thick the calculated 
volumes to the linear foot of logs of different diameters. Table 19 
gives the average thickness of sapwood and diameter of heartwood 
for logs of different diameters. In the calculations of yield, a larger 
allowance for sapwood is made than is shown in this table, for the 
reason that the sapwood is often of irregular thickness and therefore 
a greater waste is caused than the actual thickness of sapwood in- 
dicates. 
Table 18. — Theoretical volumes, in terms of one twenty-eighth inch reneer, of 
logs of different diameters, per linear foot of log. 
Diameter log ( inches). 
Sq. ft., A" 
veneer. 
Diameter log (inches). 
Sq. ft, A" 
veneer. 
12 
264 
310 
359 
412 
469 
530 
594 
662 
733 
808 
22 
887 
13 
23 
969 
14 
24 
1,056 
1,145 
15 
25 
16 
26 
1,239 
17 
27 
1,336 
1,437 
18 
28 
19 
29 
1,541 
1,649 
20 
30 
21 
