of side grain to give more than the end grain. The sphere should be
forced into the chuck with slightly over half protruding. Very thin cuts
should be taken and the sphere should be revolved one-quarter turn after
each until true. As the sphere becomes smaller during the cutting, it
will be necessary to cut the face of the chuck down and bore the hole
deeper and smaller in order to keep more than half of it protruding at
all times.

[Illustration: Mirror (See Pages 299-301).]

To remove the sphere tap the chuck lightly with a hammer just above it,
at the same time pull out on the sphere.




CHAPTER XI

SPIRAL TURNING


Spiral turning is a subject that has received very little attention by
most schools in which wood turning is taught. Spiral work is seen in
antique furniture and also in the modern furniture of the present day.
It seems that it takes the wheel of fashion about a century to make a
complete turn, for what our forefathers neglected and destroyed the
people of the present day value and cherish.

Spiral work gives excellent practice in shaping and modelling wood. It
brings into play the principle of the helix as used in cutting threads,