observation to apply the same principles to slide rest
tools.

A few examples of this class of tools are given. Fig. 12 is the
ordinary diamond pointed tool, which should be made right and left.
The cutting edge may have a more or less acute angle, according to the
work to be done, and the inclined or front end of the tool may be
slightly squared or rounded, according to the work. Fig. 13 is a
separating tool, which is a little wider at the cutting edge than any
where else, so that it will clear itself as it is forced into the
work.

For brass this tool should be beveled downward slightly. By giving the
point the form shown in Fig. 3 it will be adapted to screw cutting.

Fig. 14 shows an inside tool for the slide rest; its point may be
modified according to the work to be done. Fig. 15 is a side tool for
squaring the ends of shafts; Figs. 16, 17, 18, and 19 represent tools
for brass, Fig. 16 is a round-nosed tool for brass, Fig. 17 a V shaped
tool, Fig. 18 a screw thread tool, and Fig. 19 a side tool. In boring,
whether the object is cored or not, it is desirable, where the hole is
not too large, to take out the first cut with a drill. The drill for
the purpose is shown in Fig. 20, the drill holder in Fig. 21, and the
manner of using in Fig 22. The drill holder, B, is held by a mortised
post placed in the rest support. The slot of the drill holder is
placed exactly opposite the tail center and made secure. The drill,
which is flat, is drilled to receive the tail center, and it is kept
from turning by the holder, and is kept from lateral movement and
chattering by a wrench, C, which is turned so as to bind the drill in
the slot of the holder.

The relative position of the tool and work is shown in Figs. 25, 26,
27, and 28; Fig. 25 shows the position for brass; Fig. 26 for iron and
steel; Fig. 27 the relative position of the engine rest tool and its
work; and Fig. 28 the position of the tool for soft metal and wood.

In all of these cases the point of the tool is above the center of the
work. In the matter of the adjustment of the tool, as well as in all
other operations referred to, experiment is recommended as the best
means of gaining valuable knowledge in the matter of turning metals.

ROTARY CUTTERS.

The saving of files, time, materials, and patience, by the employment
of such rotary cutters as may be profitably used in connection with a
foot lathe, can hardly be appreciated by one who has never attempted