There are about thirty-six bits to a set, all of different shapes
and sizes; but our young friends need not get quite so many; if they
provide themselves with a couple of a medium size, this will be
sufficient, such as the center bit and the auger bit. The center bit
will cut holes varying from a quarter of an inch to three quarters of
an inch in diameter, and is used by pressing the knob end against the
chest, and twirling the center part round with the hand. It cuts a hole
very clean, leaving it quite smooth inside. The auger bit is for the
same purpose, and is used in the same manner. Another bit, called the
taper shell bit, is used for making holes wider, and is a very useful
implement.