ist pin is let into the
cross-head cheeks, so that it may be removed to be turned up true. The
clip is to prevent the piston rod nut from loosening back of itself.

Figure 329 represents a side view; and Figure 329 _a_ a section through
the centre of the eccentric and strap.

[Illustration: Fig. 327--WORKING DRAWING OF 100 H.P.
STEAM-ENGINE.--WRIST PLATE.--3" = 1 FOOT.]

The eccentric is let into the strap and is provided with an eye to
receive a circular nut by means of which the length of the eccentric rod
may be adjusted, a hexagon nut being upon the other or outer end of the
eye.

Figure 330 shows the construction of the connecting rod, the brasses of
which are adjustable to take up the wear and to maintain them to correct
length, notwithstanding the wear, by means of a key on each side of each
pair of brasses, the keys being set up by nuts and secured by check
nuts.

INDEX.

Ames' lathe feed motion, drawing a part of, 208.

Angle of three lines, one to the other, to find, 55, 56.
of two lines, one to the other, to find, 54, 55, 56.

Angles, acute and obtuse, 57.

Arc of a circle, an, 50.

Arcs, construction with four, 67, 68.

Arcs for the teeth of wheels, to draw, 205.

Arrangement of different views, 94-111.

Automatic high speed engine, drawings of, 289.

Axis of a cylinder, 51.
of an ellipse, 63.

Ball or sphere, representation of by line-shading, 87, 88.

Bed-plate, cross section of, 299.
plan and side view of, with main bearing and guide bars, 299.

Bell-mouthed body, representation of by line-shading, 88, 89.

Bevelled gear, one-half of, and an edge view projected from the same, 207.
one of which is line-shaded, 210.
wheels, 203.

Bevelled gears, small, 208.

Bevelled wheels, a pair of, in section, 208.

Bisected line, 50.

Black lines of a drawing, how to produce, 32.

Blacksmith, drawings for the, 172.

Blake's patent direct acting steam pump, 284, 285.

Boiler drilling machine, a, 269, 270.

Boiler, end view of, 297.
shell, sectional view of, 296.

Bolt heads and nuts, United States standard, 114, 118.
to draw a square-headed, 125.
with a hexagon head, to draw. 113, 114.
with a square under the head, 149.

Bolts and nuts, dimensions of United States standard, 117.
United States standard, forged or unfinished, 116.

Bolts, nuts and polygons, examples in, 112-151.

Bow pen, applying the ink to, 46.
large, with a removable leg, 22.