(fig. 56). This plane is longer and larger than the jack plane, and with a somewhat wider iron. It is used to finish the surfaces of timber which are required to be very true and straight, after the jack plane has reduced them to a fairly level surface.

Fig. 56.

The jack plane in doing this would be used with the iron 'set coarse,' and would be correspondingly rapid in its action, but could not be expected to finish smooth, and, not being so long, would not produce such a straight surface as the trying plane.

The iron of this plane, as it is required for fine work, should never be set out more than 1/32 of an inch, and usually much less. The cap-iron should be set equally fine.

The dimensions of the ordinary trying plane are 22 1/2 ins. long, 3 1/2 ins. across the face, 31/4 ins. deep, with 2 1/2-in. iron. For boys, the dimensions should be reduced to 20 ins. long, 3 ins. across the face, 3 1/4 ins. deep, with 2 1/4 -in. iron.