Fig. 12.—Clearing of wood between knife cuts.

The depth to which the spaces must be cleared will depend on their width, as, in printing, the paper will sag more deeply in a wide space than in a narrow one. In spaces of half an inch the depth of the first V-cuts is sufficient, but the proportionate depth is about that of the diagram above. The small spaces are cleared by means of small flat or round chisels without the mallet or the preliminary gouge cut: this is only needed where a large space has to be cleared.

There remain now only the placing and cutting of the two register marks or notches for controlling the position of the paper in printing.

These are placed relatively to the design as shown in fig. 13.

The corner of the print fits into the notch at A, and one edge of the print lies against the straight notch at B.

The register marks may be even closer to the space covered by the design, but must not actually touch it, as some margin of paper is necessary in printing: they should also be cut always on the long side of the printing block. It will be seen from the drawing on page 70 that these register marks correspond to the position of the thumb of each hand in laying the paper on the block for printing.