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addendum circle American Standard angle architect's scale assembly auxiliary view axis bill of materials bolt cap screws cast iron center line CHAMFER circle circular cone construction cutting plane cylinder decimal Descriptive Geometry diameter Dimension completely distance dividers draftsman drawing sheet drawn DRILL ellipse Engineering Drawing Figure fillets and rounds finish freehand french curve front view gear given guide lines hole horizontal hyperbola inch inclined isometric drawing isometric projection letters line projection located machine McGraw-Hill metal Note object oblique orthographic parallel pencil perpendicular pictorial piece pitch points primary auxiliary principal views prism Prob procedure reference line rivets scale screw threads section view shaft shown in Fig side view sions slot space square steel stroke suitable working drawing surface symbols tangent threads tion title block tool top view tracing paper triangle true length true shape types vertical welding