Elements of Mechanical Drawing

Elements of Mechanical Drawing
Use of Instruments, Geometrical Problems, and Projection.
By
Gardner C. Anthony, a.m.
Professor of Drawing Ix Tufts College; Dean of the Bromfield-pearson School
Member of American Society of Mechanical Knt.im U.-.
The Outfit 9
The Use of Instruments . . 10
Preparation of the Paper, 10 ; the Pencil, 10 ; the Scale, 10 ; a Study of Straight Lines, 11 ;
Practice in the Use of Triangles, 12; Use of Dividers, 13; Inking, 14; Lettering, 16; the
Drawing of Circular Arcs, 17 ; the Compasses, 17 ; Inking of Circular Arcs, 18.projection .51
General Instruction for Drawing, 55; Problems 1 to 12, 56; Objects Oblique to Planes, 58;
Problems 13 to 17, 59; Special Methods for the Revolution of Lines, Surfaces, and Solids, 61.
Special Problems in Projection .65
The Development of Surfaces 68
Problems 18 to 25, 70; Development of Surfaces of Revolution, 72; the Cylinder, 72; the
Cone, 73; Problems 26 to 28, 75.
The Intersection of Surfaces 76
Problems 29 to 31, 77; Use of Auxiliary Planes, 78; Problems 32 to 36, 79.
Screw-threads and Bolt-heads 81
Spirals, 81; Involutes, 82; the Helix, 82; Problems 37 and 38, 83; V and Squnre Screw-
Threads, .84; Problem ’39, 86 ; Conventional Threads, 86; the Double Thread, 86; U. S.
Standard V Thread, 87 ; Problem 40, 88.
Bolts 88
Sphere and Cutting Planes, 88 ; Hexagonal Heads and Nuts, 89 ; Problem 41, 91.
Isometric and Oblique Projection
Geometrical Definitions and Useful Propositions 20
Points, Lines, and Angles, 20 ; Triangles, 21 ; Quadrilaterals, 22 ; Polygons, 23 ; Circles, 23 ;
Solids, 24; Pyramids, 25; Prisms, 25; Cylinders, 26; Cones, 26; Sphere, 27.
Geometrical Problems 27
General Instruction, 27 ; Perpendiculars, 28 ; Angles, 29 ; Triangles, 31 ; Tangents, 32 ; Inscribed
And Circumscribed Polygons, 34 ; Construction of the Hexagon, 35 ; Inscribed and
Circumscribed Circles, 37.
Examples 39
Perpendiculars, 39 ; Angles, 39 ; Triangles, 40 ; Tangents, 40 ; Inscribed and Circumscribed
Polygons, 41 ; Hexagons, 41 ; Inscribed and Circumscribed Circles, 42.
Conic Sections , 43
The Ellipse, 44 ; the Inking of Curves, 47 ; the Parabola, 48 ; the Hyperbola, 49.
Examples .
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