An

For five mills at which a lumber grade recovery study was made
in addition to the wood residue study, the number of board feet per
cubic foot log scale was calculated for 12-foot logs and 16-foot logs
by one-inch diameter olasscs ranging from 6 to 20 inches. These figures
are shown in Table V and indicate the variation in the board foot-cubic
foot ratio with diameter and length of log.

TABLE V

Board Feet per Cubic Foot for Spruce Logs
___ (curved values based on log scale)

'

| Average | | Average
Or te ee ee

i nee Tepe ROoe Logs i 16-foot Logs
| Diameter | Nos: of + Roard Feet per! Yo. of | Board Feet per
| Logs | Cubic Foot | Logs | Cubic Foot
| te ee ee a
| 6 ; zi 344 | 9 ra0) |
| | 0 0 52 | 368 |
| a. 4 2D Aa6 | 61 | A.4
9. J 48 | Fee 100 | 4.9

| 205] 45 | a4 | cide aia
11 | Bora eee | TGs | 54
12 Ae 59 Se| 1051 5.6
1 S| A tea Sle Sie! 5.8
ee 34 602 68 | Beoe |
ica | 26. | ao | 67 6.1
Vance | G5 | 4B | 6.2

ieee 18 | 66,4 44 | 6.3
18 Brea Gee | DD) 6.4
19 gies bee - 16 | 6.5
| 20 8 | 6.9 | Bia 6.6

t i i '
Masta accen poe pe
| iTotal 417 | Weighted ¢,o j Total 919 Weighted 5,7
H t

-

6. Volume of Wood Residue Produced

A survey made in 1931 in this area showed that the average
volume of solid residue and sawdust produced at that time was lower than
the figures presented in this report (6), The 1931 survey was made at
the larger mills which ore usually more efficient. Also, the size and
quality of the average log has decreased and there is a greater percent-
age of wood residue in the smaller diameter logs.

F
( ds, H. Jenkins, "Sawmill Waste and its Utilization in British Columbia"
Forest Service Bulletin 86.