This has proved to be a very economical use of power and plant.
[Illustration: Fig.29.Donkey Engine Yarding.] [Illustration: Fig.30.Giant Raft.

In the background is a completed raft; in the foreground a cradle in which a raft is being built.] Another method of traction where the woodland is open enough is with a traction engine.

The ones employed have sixty to one hundred horse power.

The great logs may be placed on wood rollers, as a house is when moved, or the logs may be hauled in on a low truck with broad wheels.

The "tractor" hauls the log direct to the railway if the distance is not too great.
[Illustration: Fig.31.Snow Locomotive.