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