and using a holder (Fig. 7) having an angular groove for receiving the
cylinder on which the cutting edges are formed. The blank can be
spaced with sufficient accuracy, by means of a fine pair of dividers,
and after the first groove is cut there will be no difficulty in
getting the rest sufficiently accurate, as a nib inserted in the side
of the guide enters the first groove and all of the others in
succession and regulates the spacing.

One of the best applications of this tool is shown in the small
engraving. In this case a table similar to the saw table before
described is supported in a vertical position, and arranged at right
angles with the cutter mandrel. The mandrel is of the same diameter as
the cutter, and serves as a guide to the pattern which carries the
work to be operated upon. The principal use of this contrivance is to
shape the edges of curved or irregular metal work. The casting to be
finished is fastened--by cement if small, and by clamps if large--to a
pattern having exactly the shape required in the finished work.

[Illustration: METAL SHAPING.]

By moving the pattern in contact with the table and the mandrel, while
the latter revolves, the edges of the work will be shaped and finished
at the same time. By substituting a conical cutter for a cylindrical
one, the work may be beveled; by using both, the edge may be made
smooth and square, while the corner is beveled.

The tool shown in Fig. 12 might properly be called a barrel saw. It is
made by drilling in the end of a steel rod and forming the teeth with
a file. To avoid cracking in tempering a small hole should be drilled
through the side near the bottom of the larger hole. To insure the