ELEVATION OBLIQUES
Elevation obliques orient aprincipal vertical face or set of
vertical planes parallel to the picture plane and therefore
reveal their true sizes, shapes, and proportions.
• To construct an elevation oblique, we begin with an elevation
view of the principal face of the subject. This should be the
longest, the most significant, or the most complex face of
the subject.
From significant points in the elevation view, w t hen
e
project the receding lines back at the desired angle into the
depth of the drawing.
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Indrafting w triangles, we typically use 45·, 30·, or 60.
ith
angles for the receding lines. In sketching, we need not be as
precise, but once we establish an angle for the receding
lines, we should apply it consistently.
• Remember that the anglewe use for the receding lines
alters the apparent size and shape of the receding planes.
By varying the angle, the horizontal and vertical sets of
receding planes can receivedifferent degrees of emphasis.
In all cases, the primary emphasis remains on the vertical
faces parallel to t he picture plane.
• To offset the appearance of distortion, we may reducethe
receding lines to 1 2/3, or 3f4 of their t rue lengths.
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78 I ARCHITECTURALGRAPHICS