or drills.

[Illustration: _Fig. 274. Fig. 275. Fig. 276. Steel Frame Breast Drills._]

STEEL FRAME BREAST DRILL.--These drills are made with both single and
double speed, each speed having three varieties of jaws. The single
speed is very high, the ratio being 4-1/2 to 1, which makes it
desirable to use for small drills, or for use in wood.

A level is firmly set in the frames of these tools to assist the user to
maintain a horizontal position in boring. Each of the forms shown has a
ball thrust bearing between the pinion and frame. The breast plate may
be adjusted to suit and is locked by a set screw. The spindle is kept
from turning while changing drills, by means of the latch mounted on the
frame, and readily engaging with the pinion. The crank is pierced in
three places so that the handle can be set for three different sweeps,
depending on the character of the work.

Figure 274 has a three jaw chuck, and has only single speed. Figure 275
has an interlocking jaw, and is provided with double speed gearing.
Figure 276 has a universal jaw, and double speed.

PLANES.--The most serviceable planes are made in iron, and it might be
well to show a few of the most important, to bring out the manner
employed to make the adjustments of the bits.

In order to familiarize the boy with the different terms used in a
plane, examine Figure 277. The parts are designated as follows: 1A is
the double plane iron; 1 single plane iron; 2 plane iron cap; 3 cap
screw; 4 lever cap; 5 lever cap screw; 6 frog complete; 7 Y adjusting
lever; 8 adjusting nut; 9 lateral adjusting lever; 11 plane handle; 12
plane knob; 13 handle bolt and nut; 14 knob bolt and nut; 15 plane
handle screw; 16 plane bottom; 44 frog pin; 45 frog clamping screw; 46
frog adjusting screw.

[Illustration: _Fig. 277. Details of Metal Plane._]

RABBETING, MATCHING AND DADO PLANES.--Figure 278 shows a useful form of
plane for the reason that it is designed to receive a variety of irons,
adapted to cut rabbets.

The detached sections of Fig. 278 show the various parts, as well as the
bits which belong to it. 1, 1 represent the single plane irons; 4 the
lever cap; 16 the plane bottom, 50 the fence; 51 the fence thumb screw;
61 the short arm; 70 the adjustable depth gage; 71 the depth gage which
goes through the screw; and 85 the spurs with screws.

MOLDING AND BEADING PLANE.--A plane of the character shown in Fig. 279
will do an immense variety of work in molding, bea