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angle assembly drawing auxiliary view axes bill of material blue print bolt center line chapter chart circle arcs cone construction curve cutting plane cylinder Descriptive Geometry detail drawings diagram diam diameter dimension lines distance divided draftsman drawn edge ellipse engineering figure finished freehand front view gear give given head height hole horizontal lines hyperbola illustrated in Fig inches inclined intersection isometric isometric projection letters machine major axis McG.H measuring metal method necessary object oblique oblique projection orthographic projection paper parallel pencil perpendicular perspective pictorial drawings picture plane piece pipe pitch position practice prism problems radius revolved rivets scale screw screw threads shade lines shaft shape sheet shown in Fig side view space square standard steel stroke structure surface symbols T-square tangent thread tion top view tracing triangle true length vanishing point vertical lines width