aie nes

IV. RESULTS OF THE SURVEY
i ¥olumes of Residue

Results of the study are shown in Table I and Table II. Table I
shows the volume of solid residue per M ft.b.m. log scale produced by:
(2) Sawmills cutting over 20 M ft.b.m. per 8-hour shift and (bo) Sawmills
cutting 20 M ft.bem. or less per 8-hour shift. At all mills the cut was
predominantly western white spruce but small amounts of Douglas fir,
true fir, and lodgepole pine were sawn at some of the smaller mills.

Table II shows the volume of sawdust per M ft.b.m. log scale
produced by the same mills, This volume of sawdust refers to the wood
in solid form. When it is converted to sawdust it will assume a greater
volume owing to the air spaces between each particle. Weighing and volume
studics on sawdust indicate that 2.5 cubic fect of sawdust are produced
from one cubic foot of solid wood.

It is outside the scope of this report to discuss the relative
merits of the three types of headsaw. Each has its advantages and dis-
advantages. However, studies in other arsas show a definite aving in
log volume by the use of band headsaws. It should also be noted that
mills cutting over 20 M ft.b.m. per day produce less solid residue.

This is probably due to the fact that the average log cut at these mills
is larger than at the smaller mills (see Table III and Figure I).