118.

Full stroke cam, method of drawing or marking out a, 237-241.

Gear, part of, showing the teeth in, the remainder illustrated by circles, 209.

Gear teeth, names of the curves and lines of, 193.

Gear wheels, drawing, 193-222.

various examples for laying out, 214-222.

Gearing oval, construction of, 210.

General view, 94.

Geometrical terms, simple explanation of, 48.

Geometry, advantage of to the draughtsman, 48.

Governor of an engine, 292, 293.

Guide bolts from one pulley to another, arrangement of idle pulleys to, 264.

Heart cam, to draw, 75, 76.

Hexagon, a, 62, 63.

head, representation of a piece with, 96.

head, to draw the end view of, 125, 126, 127.

headed screw, to draw, 113, 114.

radius across corners, 138.

Hexagonal form, representation of, 98.

or hexagon heads of bolts, 118, 119.

Hole, representation of by shade or shadow line, 83.

Hollows in connection with round pieces, representations of, 87-89.

Hypocycloides for the flanks of teeth, to trace, 200.

Independent condenser, 288.

India ink, advantages of in drawing, 30.

difference between good and inferior, 31

good, characteristics of, 31.

India ink, Higgins', 30.

mixing, 25.

testing, 31, 32.

the two forms of, 30.

to be used thick, 32.

use of, 30.

use of on parchment, 32.

Ink, applying, to the bow pen, 46.

for drawing, 30-33.

Instruments, preparation and use of, 34-47.

Iron planing machine, representation of, 282.

Iron, wrought and cast, representation of by cross-hatching, 82.

Journal, 294.

Journals of shafts, 277.

Key, a, drawn in perspective, 92, 93.

drawing of a, 91.

marking the dimensions of on a drawing, 92.

representation of with a shade line, 84.

Knuckle-joint, pencil eye for, 146.

with an offset, 147.

Large bow or circle pen, joints of, 23.

Lathe centre, representation of, 86.

Lathe feed motion, drawing of a part of a, 208.

Lead pencils for drawing, 23.

Lead, representation of by cross-hatching, 82.

Left-hand thread, 156.

Lever, a, actuating a plunger in a vertical line, to find how much a given amount of motion of the long arm will actuate the plunger, 152-155.

threads of a large diameter, 156.

Section lining or cross-hatching, 77-82.

Sectional view of a section of a wheel, for showing dimensions through arms and hub, 202.

Sector of a circle, 51.

Segment of a circle, 50.

Semicircle, 51.

Shade curve, representation of, 87.

line produced for circles, 84.

Shade line, produced in straight lines, 84.

or shadow line, 82.

Shading a Medart pulley, 280.

and coloring, points to be observed in, 278.

brush, 281.

by means of lines to distinguish round from flat surfaces, and denote relative distances of surfaces, 85.

example in, of a Blake's patent direct acting steam pump, 284, 285.

example of, in an independent condenser, 288.

light in, 280.

simple, 277.

to show by, that the surfaces are highly polished, 282.

Shadow line, 82.

lines and line shading, 77-90.

Shaft for cam plate, 301.

Shaper link, quick return, plotting out the motion of a, 250-253.

Shoe against a cam, to find the position of the face of, 228.

Side elevation, drawing a, 106.

Sides or flats of work, to find the lengths of, 135, 136.

Slots not radiating from a centre, to draw, 131, 132.

radiating from a centre, 131.

Spiral spring, to draw, 166.

Spiral wound round a cylinder, whose end is cut off at an angle, 178.

Spirals and screw threads, 152-168.

Sponge, rubber, 26.

Spring bow pencil, for circles, 22.

pen, for circles, 22, 23.

Spring, spiral, to draw, 166.

Spur wheel teeth, how to draw, 194.

Square, a, 59, 60.

body, which measures one inch on each side, to find what it measures across the corners, 136.

Square part, a representation of, 96.

parts, use of a cross to designate, 95, 96.

thread, to draw a, 162-164.

Steam boiler, horizontal, for stationary engine, 296.

chest and valves, 301.

chest side, and horizontal cross section of cylinder, 301.

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

Steel, representation of, 277.

representation of by cross-hatching, 82.

square, improved, with pivoted blade, 19.

Steps, to draw a piece containing, 99-101.

Stock and die, pipe-threading, drawing of, 85.

Straight line in geometry termed a right line, 49.

or lining pen, use of with a T square

                                                                                                                                                                                                                                                                                                           

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