in and wheel, 294.

Cross-hatching or section lining, 77-82.
made to denote material of which the piece is composed, 81, 82.
may sometimes cause the lines of the drawing to appear crooked to the
eye, 80, 81.
representation by, of a section of a number of pieces one within the
other, the central bore being filled with short plugs, 78, 79.
representation by, of three pieces put together, having slots or keyways
through them, 79, 80.
the diagonal lines in, should not meet the edges of the piece, 78.

Cross-head, 301.

Cross, use of, to designate a square, 95, 96.

Cube, with a hole passing through it, to draw, 101, 102.

Cupped ring, representation of, 98.

Curved outline, representation of, 86, 87.

Curve for tooth face, how to find, 198.
representation of the radius for, 87.

Curves and lines, 48-76.
of gear teeth, names of, 193.

Curves for moulding cutter, to find the, 257-263.
of thread, template for drawing, 165.
of wheels, construction, to find, 204.
screw threads, drawing, 159.
templates called, 21.
use of, in practice, 21.

Cut-off cams, employed instead of eccentrics on steamboats, examples in
drawing, 232.
manner of finding essential points of drawings of, 241-244.
necessary imperfections in the operations of, 247-249.
part played by the stroke of the engine in determining the conformation
of, 241.

Cut-off mechanism, 301.

Cutting tool for a planing machine, representation of, 264-266.

Cylinder, 299.
a solid, representation of, 94, 95.
intersecting a cone, 186
of an engine, 299-301.
of an engine, drawing of, 289.

Cylindrical body joining another at a right angle, a, 180.
body whose top face, if viewed from one point, would appear as a straight
line, or if from another as a circle, 188.
piece of wood, which is to be squared, and each side of which square must
be an inch, to find the diameter, 136.
pieces and cubes, representation of, 95.
pieces, representation of, by cross-hatching, 77, 78.

Cylindrical pieces, representation of three, one within the other, by
cross-hatching, 78.
pieces that join each other, representation of, 86.
pin line-shaded, representation of, 86.

Decagon, a, 63.

Degrees of a circle, 52-55.

Diameter of a cylindrical piece of wood, which is to be squared, and each
side of which square must measure an inch, to find, 136.

Diamond, a, 59, 60.

Different views, arrang