Robson, William: Grammigraphia; or the Grammar of Drawing. (London, 1799)

44

OF LINES,

PERPENDICULAR,

HORIZONTAL,

OBLIQUE,

CURVE,

Parallel with the sides of the
paper.

Parallel with the top and
bottom of the paper.

Any direction on the space
between the Perpendicular
and Horizontal, proceeding
from their intersecting point.

Any single turn, in either of
the three positions, as fol-
lows :

EXAMPLE.

Perpendicular
Curve.

Horizontal
Curve.

Oblique
Curve.

All the variety of appearances in nature are presented by
a combination of these four lines ^ placed agreeably to Pro-
portion and Position. Firmness and freedom of representa-
tion are acquired by a perfect knowledge of the junction of
these lines) that they may be justly appropriated.