With the gage, mark short lines at the points of insertion in the center of each edge, gaging from the outside faces.
Across these lines score accurately with a try-square and knife.

Then bore the holes with a dowel-bit at the intersection of the lines, Fig.
263.

If this is carefully done, the holes will be directly opposite one another, and equidistant from the faces of both boards.

All the holes should be of equal depth, say 1", in order that the dowel-pins, which should also be cut of equal lengths, may be interchangeable.
After boring, the holes may be slightly countersunk in order to insure a tight joint and the easy slipping of the pins into place.

The latter result may also be obtained by slightly pointing the pins with a dowel-pointer, Fig.