By letting the saw run in the kerf thus made, you can cut pieces off square.
The cut is made on the pulling stroke, and hence the kerf can be very narrow.
Until the kerf is well started, the saw should be held so that the teeth just touch the wood.
When the kerf is well started, the whole weight of the saw may be applied.
Where the whole body of the tooth is bent, the saw will run smoothly and easily through the kerf and produce a smooth-cut surface.
Make the notch, or kerf, large enough to avoid pinching your axe in it.
If you start with too narrow a kerf, or notch, before you finish you will be compelled to widen it.
The teeth should cut a kerf just wide enough to clear the blade.
Cut your kerf on the side toward the landing place, let the notch go half-way or a trifle more through the trunk.
Little by little the axe bit through the tough wood, until the kerf was well past the heart of the tree.