Part 15

=Terms and Definitions=, Preliminary 41

=Test-Pieces=, Use of, in Blue Prints 188

=Tetrahedron=, def. 48

=Theorem=, def. 83

=Thumb-Tack= illus. 109, desc. 110

=Tints and Colors=, desc. 184

=Title and Date=, on Sketches 142

=Title, Date, Scale, etc.=, Office Rules for 192

=Title Page= vii

=Tracing-Cloth=, desc. 186

=Tracings=, Office Rules for Keeping 195 Tinted and Shaded, desc. 184

=Trammels=, desc. and illus. 125

=Trapezium=, def. 48

=Trapezoid=, def. 48

=Trestles=, Drawing-Board, desc. and illus. 110

=Triangle=, def. 50 To Describe a Circle about a 93

=Triangle, or Set-Square=, desc. and illus. 114 How to Use desc. 147, illus. 166

=Triangles=, illus. 102 To Construct 92

=Trigonometry=, principles and def. 98

=Trisect=, def. 50

=Trundle Wheel= desc. 201, illus. 208

=Two-foot Rule=, illus. 128

=U. S. Standards=, Pipes 279

=Upright Lines=, How to Draw 61

=Useful Tables for Draughtsmen= 269-280

=Valve=, Blow-off desc. 174, illus. 175

=Valve Gear=, or Link Motion, illus. 225

=Vanishing Point=, def. and illus. 251 In Drawing, illus. 250 In Perspective Drawing 252

=Varnish=, Shellac, for Drawings 241

=Versed Sine= of an Arc 99

=Vertex=, def. 51 Of an Angle, def. 42

=Vertical=, def. 51, 251

=Vertical Lines=, in Perspective 257

=Vertical-Plane=, def. 249

=View=, def. 51

=Visual Ray= in Perspective Drawing 256

=Visual Rays of Light= desc. 252, illus. 255

=Vulcanite=, Section-Lining, illus. 182

=Water Reflection= in Perspective Drawing, illus. 246

=Wheel=, Bevel, A, illus. 203 Crown, illus. 208 Helical, A, illus. 207 Hub, Section-Lining, illus. 184 Internal Gear, desc. 201, 207 Miter, A, illus. 204 Proportions of the Teeth of a 210 Spur illus. 198, desc. 199, 201 Worm, desc. 201

=Wood=, Section-Lining, illus. 182

=Working Drawing=, Bending Machine 220-1 Def. 51 Illus. 218, 220, 221, 222, 223, 224, 225, 226, 228 Bumping Post, illus. 226 Points, etc. 243 Power Punching Press 222 Numbering a, Office Rules for 195 To Read a 229

=Working Drawings=, desc. 219, 227

=Worm-Gear=, desc. 206

=Worm-Wheel= desc. 201, illus. 206 Speed of a 216

=Wrench=, illus. 75

=Wrist-Lines=, illus. 64

=Wrought-Iron=, Section-Lining, illus. 182

Transcriber’s Notes

Inconsistent and unusual spelling, capitalisation and hyphenation have been retained, unless mentioned below. The discrepancies between the General List of Contents and the structure of the text have not been corrected.

Depending on the hard- and software used to read this text and their settings, not all elements may display as intended. Where scales are given for illustrations, these can, of course, not be relied upon for measurements.

The numbering of illustrations in the book is inconsistent. Illustrations that have no numbered captions may or may not be counted; this has not been standardised, except as listed below. Missing illustration numbers have been added only where they are referenced in the text. The illustrations referred to in the text as Figs. 242 and 243 are captioned Fig. 243 and 244.

Page 65-69 and Figs. 66-71: the text uses upper case reference letters, the illustrations lower case, which has not been standardised.

Page 84, table of symbols: the source document uses letters (O and L) rather than symbols for circle and angle.

Page 94, Bisect two of the angles _A C_ of the triangle: presumably the unmarked point A is in the lower left-hand corner of the illustration.

Page 113, The tee-square, as shown, ...: there is no illustration with the relevant reference numbers; probably the reference is to Fig. 151/152.

Page 239, rough irregular lines, as in fig. 134, on page 131: there is no Fig. 134 on page 131; page 134 nor page 131 show the rough irregular lines. Several other illustrations in the book do show such lines.

Index: the order of entries is as printed in the source document.

Changes made:

Illustrations and Notes have been moved out of text paragraphs.

Some obvious minor punctuation and typographical errors have been corrected silently.

In some tables the ditto symbol („) has been replaced with the dittoed text; some tables have been split or re-arranged. The use of × and x in multiplications and dimensions has been standardised to ×.

Page 48: Figure numbers 45-49 added to illustration.

Page 89: and on _B_ on _B I_ changed to and on _B_ on _B D_.

Page 177: D = diam. of collar changed to d = diam. of collar.

Page 193: Bbt.--Babbit. changed to Bbt.--Babbitt.

Page 203: as described on page 191 changed to as described on page 199.

Page 214: 4 tenths measured at the 2′ line changed to 4 tenths measured at the 2″ line.