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30 degrees 4/5ths method adjustable set-square aircraft artist assembly axis bevel gear blueprint bolt Bristol Board centre line circles colour Craftint curved cut-away cutting planes cylinders datum line dots drawn ellipses engineering drawing engraver examples exploded view Fairey Aviation finished freehand grid half-tone helix holes horizontal illus inch inkwork isometric large number layout Letraset lettering letterpress major axes mechanical milling cutter minor axes natural necessary object obtained orthographic outline drawing parallel pencil perspective perspective projection photographic picture position possible principle printing process white produce projection pump Rapidograph reader reduced relief printing reproduction right angles rotor rule scraper-board screen screw screw threads shading shape shown in Fig similar sketch stage stippling student suitable surface technical illustration technique teeth threads three-dimensional tint tion tone tracing paper valve plate vane vanishing point vertical viewer width Zip-a-tone Zipatone