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alphabet angle Architect's Scale axes axis barograph bolt called cavalier projection center lines chapter chart circle construction contour lines coordinate planes cube curve cylinder detail diagram diameter dimension lines dimetric distance draftsman drawn drill edge elevation ellipse Engineer's Scale engineering drawings equal Figure gage given graphical head height hence holes horizontal plane inch indicated intersection isometric drawing isometric plane isometric projection length letters machine drawing method necessary nomograph notes object oblique projection orthographic projection outlines oval paper pencil perpendicular perspective picture plane piece placed plane of projection plotted point of sight practice projecting lines proper purposes radius represent rivet rule scale screws section planes shape sheet shown in Fig side simple sketch space standard steel straight line stroke structure surface symbols T-square tangent thread tion tracing triangle trimetric projection truss usually vanishing point vertical plane width