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Preface to the American Edition
In pencil in crayon in ink Freehand and with
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angle of 45 appears architect architectural drawing auxiliary planes barrel vault broken line building Central Perspective circular color column contour lines corner corresponding cross vault cube cutting planes cylinder depth dimensions Determining the True diagonal distance divided dot-dash line ellipse eraser example freehand front edge front elevation frontal plane geometrical Heinrich Tessenow helicoidal helix hip roof horizon line horizontal plane illustration intersection curve Isometric projection isometric view lettering light direction light rays major axis midpoint object oblique projection parabola parallel pencil picture plane plan and elevation points of intersection prism produces projection pyramid radius rafter Roof Layouts roof surfaces ruled surface scale Shade and Shadows shadow construction shadow projection shadowpoint side elevation side view sketches space stairs station point steps straight line sundial surface lines tangent technical drawing tion transferred triangle true angle true length vanishing lines vanishing point VP vertical wall width