TONAL VALUES IN ARCHITECTURAL DRAWINGS
We use tonal values in section drawings to
establish contrast between the cut elements
and what is seen in elevation beyond the plane
of the cut.
• The top drawing uses a heavy line weight to
outline the cut elements.
• The center drawingprojects the cut
elements forward witha dark value.
• The bottomdrawing reverses the value
system and renders the cut elements as
light figures against adark field.
• Notethat in the latter two cases, the
relationship of the building to the
supporting ground mass is clearly indicated
by the m
anner in which the ground is given a
value similar to that of the cut elements of
the building.
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I ARCHITECTURAL GRAPHICS