O

Obiique cones, 155, 156 Oblique planes, bevels in, 141

Oblique projection, 100-113 Oblique projection dimi nished, 105 ; half scale, 102, 103 ; theory of, 102 Oblique projection, varieties of, 100 Oblique scale, 106 Octagon chimneys, 192; roofs, 72; setting-out an, 193-193 Octagonal roof, 71, 72 ;

prism, 88 ; pyramid, 87 Octagons, 87, 192 Ogee arch, 171 ; mouldings,

39 : root, 72 Optical corrections in lettering. 44

Ordinates, delinition of, 10; of ellipse, 151, 157; of parabola, 158 Orthographic projection, 4681

Orthographic projection, meaning of term. 48; principles of, 2

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