Geometrical drawing, projection drawing, freehand and ornamental drawing, wash work and brush drawing, elementary perspective drawing, architectural drawing (1921)
International Correspondence Schools · Scranton, PA : International Textbook Co. · leaf 325
e vanishing point of the line of intersection betweenthe inclined planes, or, in other words, the valley of the roofslope, V^ and F being the vanishing points of the inter-sections of roof slopes at an angle of 45°, while F^ and F^show the vanishing points of lines of intersection of theroof slopes… … Fic;. 2h §5 ELEMENTARY PERSPECTIVE DRAWING 39 38. Any part of an object in contact with the pictureplane may be laid off to a proportional scale direct (rule I,Art. 7), and if the perspective is to be drawn full size, thedetails of the object in contact with the picture plane maybe laid off to a…
