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airbrush American Drawing Inks artist axis axonometric drawing axonometric projections basic blades bottle brush center cube chart circle color construction Craftint curve diagram dimensions dimetric family dimetric projection drafting draftsman drawn duction ellipse engineering illustrator foreshortened fountain pen frisket heliographic Higgins American Drawing horizon line horizontal IJVC IJVK indicate industrial illustration ink line ink tracing isometric drawing isometric projection layout lettering light located machines manufacturing illustrations method object observer's eye orthographic drawings orthographic projection overlay paper parallel perspective pencil photograph picture plane plane of projection plate position printing production illustration projection angles protractor reproduced rubber cement ruling pen scale ratios scratchboard Screw sections shading sheets shown in Fig station point stencils step stipple surface templates three dimensional drawing tilt tion tracing cloth Training Aids trimetric valve vanishing point vertical visual aids visual rays Washer Nut Waterproof India Ink Wrico