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The smaller mills are generally located in the woods near their log supply and the slabs and sawdust produced are either left in piles or burned.

III. METHOD OF MAKING SURVEY

Owing to the large number of mills in the region, it was not possible to study each mill in detail. Certain representative mills were therefore selected whose layout made possible a fairly accurate measure- ment of the waste.

1. Measurement of Logs

The length and diameter at both ends of each log were measured on the log deck during the study. The board foot and cubic foot contents of the logs were based on the British Columbia Log Scale and the British Columbia Cubic Scale respectively.

2@e Measurement of Solid Residue

Members of the study crew were stationed at convenient points in the mill for measuring the solid residue.

This solid residue was segregated into two main classifications, as follows:

Slabwood - included all wood which was cut from the outside of the log. It was either half-round slabs or quarter- round edgings.

Rectangular pieces - included all wood (mainly trimmings) which had three square dimensions.

All measurements were made inside the bark and for the purpose of this report bark was disregarded.

3. Measurement of Sawdust

The board foot and cubic foot contents of the logs were measured as in the study on solid residue. Members of the study crew were stationed at each of the main sawing michines. These included headsaw, edger, gang saw, and trim saws.

The length and depth of each cut made by the saws in the various machines were tallied. Knowing the kerf of the various saws it was possible to calculate the amount of solid wood converted into sawdust.