Drafting Terms

Description

This section is from the book "The New Metal Worker Pattern Book", by George Watson Kittredge. Also available from Amazon: The new metal worker pattern book.

Drafting Terms

166. Projection is that department of geometrical drawing which treats of the drawing of elevations. plans, sections and perspective views. There are four kinds of projections, viz.: Orthographic, Isometrical, Cavalier and Perspective. Chapter III (Linear Drawing) is devoted to an explanation of the principles of orthographic projection.

Fig. 94. - Section of House on Line A B of Plan and Elevation.

167. An Elevation is a geometrical projection of a building or other object on a plane perpendicular to the horizon. (Pig. 92.)

168. A Plan is the representation of the parts as they would appear if cut by a horizontal plane. (Fig. 93.)

169. A Section is a view of the object as it would appear if cut in two by a given vertical or horizontal plane. (Fig. 94.) In the one case the resulting view is called a vertical section, and in the other a horizontal section. Oblique sections are representations of objects cat at various angles.

Fig. 95. - Perspective View of House.

170. A Perspective is a representation of a building or other object upon a plane surface as it would appear if viewed from a particular point. (Fig. 9.5.)

171. A Detail Drawing or Working Drawing is a drawing, commonly full size, for the use of mechanics in constructing work.

172. A Scale Drawing is one made of some scale less than full size.

173. A Miter is a joint in a molding, or between two pieces not moldings, at any angle.

174. A Butt Miter is the term applied to the cut made upon the end of a molding to lit it against another molding or against a surface.

175. A Gable Miter is the name applied to the miter either at the peak or at the foot of the moldings of a gable or pediment.

176. A Rake Miter is a miter between two moldings, one of which has undergone a modification of profile to admit of the joint being made.

177. Square Miter is the common term for a joint at right angles, or at 90°.

178. An Octagon Miter is a miter joint between two sides of a regular octagon, or between any two pieces at an angle of 135°.

L79. An Inside Miter indicates a joint at an interior or re-entrant angle.

180. An Outside Miter is a joint at an exterior angle.

181. The Development of a surface is the process of finding, from a drawing of a rounded form, a shape or pattern upon a Bat surface which, when cut out and bent or formed as indicated by that drawing, will constitute its envelope; or, in other words, the stretching out flat of a surface shown by a drawing to be curved.

Alphabetical List

In the following list all words are arranged in alphabetical order, the figure following each referring to the number of the definition in the list preceding:

Abacus..................		138
Acute Angle...........		14
Altitude..................		35,100
Angle......................		12
Angle, Right............		13
Angle, Acute..............		14
Angle, Obtuse.............		15
Apex.........................		31
Arc............................		59
Arch..........................		120
Architrave................		118
Axis...........................		109
Base............................	32. 121, 124
Bed Course..................		145
Bed Moldings.................		144
Bracket...........................		130
Bracket Molding...........		149
Broken Pediment..............		126
Butt Miter........................		174
Capital..............................		138
Center.............................		54
Chord...........................		60
Circle............................		52
Circumference................		53
Circumscribed ........		66
Column ..............		121
Complement......................		69
Concave...........................		114
Concentric........................		64
Cone................................		94
Cone, Oblique or Scalene..		96

Cone, Truncated..................	97
Conic Section.........................	113
Convex..................................	115
Corbel.....................................	133
Cornice..................................	116
Co-Sine..................................	72
Co-Secant..............................	76
Co-Tangent............................	74
Crown Molding......................	142
Cube......................................	89
Cylinder, ................................	90
Cylinder. Elliptical........	91
Cylinder, Oblique.........	93
Cylinder, Right.....................	92
Decagon................................	48
Deck Cornice........................	129
Degree...................................	68
Dentil...................	132
Dential Course.....................	147
Detial Drawing.....................	171
Development...........................	181
Diagonal................................	51
Diameter................................	56
Die......................	124
Dodecagon............................	49
Dodecahedron....................	107
Drip ....................	155
Elevation..............................	167
Ellipse..................................	78
Elliptical Cylinder........	91
Engaged Column...................	121

Entablature..........	117
Envelope.......................	110
Evolute.........................	81
Eccentric......................	65
Fascia..........................	153
Fillet................	154
Finial..............................	137
Flange............................	164
Foot Molding................	148, 118
Frieze...........................	119
Frustum.........................	112
Gable..............................	127
Gable Miter.....................	175
Gable Molding........	150
Geometry............	1
Globe................	102
Head Block..........	134
Heptagon............	46
Hexagon ............	45
Hexahedron .........	105
Hip .................	165
Hip Molding.........	152
Hyperbola...........	80
Hypothenuse.........	30
Icosahedron ..........	108
Impost..........................	120
Incised Work.........	158
Inscribed.............	66, 67
Inside Miter..........	179
Intersection of Solids....	111
Involute.......................	82

Keystone.....................	120
Line.............................	4
Line, Curved................	6
Line, Horizontal..........	8
Line, Inclined or Oblique.........	10
Lines, Parallel........................	7
Line, Perpendicular...............	11
Line, Straight............	5
Line, Vertical........................	9
Lintel Cornice.......................	128
Lozenge............................	41
Miter................................	173
Modillion...........................	131
Modillion Course................	146
Molding.................	141
Neckmold............................	138
Normal Profile...........	163
Oblique Cone.........................	96
Oblique Cylinder..................	93
Obtuse Angle.......................	15
Octagon..............................	47
Octagon Miter.....................	178
Octahedron.......................	106
Outside Miter.....................	180
Panel....................	139
Parabola............................	79
Parallelogram.....................	39
Pedestal...............................	124
Pediment................	125
Pediment, Broken...................	126
Pentagon...............................	44

Perineter..................................	50
Perspective..............	170
Pilaster..................	123
Pinnacle.................................	136
Plan.....................	168
Planceer..................................	143
Plane ....................	17
Plane Figure...........................	20
Point....................	3
Polygon..................................	22
Polyhedron ..............	103
Prism ...................	84
Prism, Hexagonal........	88
Prism, Pentagonal........	87
Prism. Quadrangular......	86
Prism, Triangular........	85
Projection ...............	166
Pyramid.................................	98
Pyramid, Right...........	99
Quadrant................................	62
Quadrilateral ............	36

Radius.....................................	55
Rake....................	160
Rake Miter...............	176
Rake Moldings...........	160
Raked .Molding...........	161
Raked Profile.............	162
Rectangle................	42
Rectilinear Figure........	21
Rhomboid ...............	40
Rhombus ................	41
Ridge Molding...........	151
Right Angle..............	13
Right Cone...............	95
Right Cylinder...........	92
Right Line...............	5
Right Pyramid...........	99
Scale Drawing............	172
Scalene Conc.............	96
Scalene Triangle..........	26
Secant...................	75
Section...................................	169

Sector...................................	61
Segment...............................	58
Semicircle ...............	57
Shaft....................	121
Sides of a Triangle.......	33
Sink.....................	157
Sine.........................................	71
Slant Hight..............	101
Soffit....................	156
Solid....................	83
Sphere.....................................	102
Springing Line...........	120
Square ..................	43
Square Miter.............	177
Stay........................................	159
Stile.....................	139
Stilted...................	120
Stop Block................................	135
Supplement..............................	70
Surface...................................	16
Surface, Double Curved.. ......	19

Surface, Single Curved...............	18
Tangent....................................	63
Tangent of an Arc........	73
Tetrahedron .............	104
Trapezium...............	37
Trapezoid ...............	38
Triangle.................	23
Triangle, Acute-Angled. ..........	28
Triangle, Equilateral......	24
Triangle, Isosceles........	25
Triangle, Obtuse-Angled...........	29
Triangle, Right-Angled...........	27
Triangle. Scalene.........	26
Truncated Cone..........	97
Truncated Pyramid.......	97
Truss ...................	134
Versed Sine..............................	77
Vertex....................................	34
Volute...................	140
Voussoir ................	120
Working Drawing........	171

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Drafting Terms

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