The blade of a jack plane is most efficient when it is ground well away towards the corners, as at a b in Fig.

The jack plane, used first by the carpenter for rapid surfacing, is distinguished primarily by the bezeled and slightly convex edge of its cutting iron.

Pullman was a carpenter who worked with a jack plane, and a saw, and things.

As the jack plane has its bit ground with a curved edge, it is admirably adapted for taking off the rough saw print surface.

Again, the carpenter invents and patents an improvement in jack planes.