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

**3

View of the Positions which are formed by each of
the Seven Situations.

This is only the former View reversed, but it should be
clearly known in both Views,

VIZ. THA T

Situations

3.4.6 form a PERPENDICULAR.
1.4.5 form a HORIZONTAL.

2.4.5.6.7 form an OBLIQUE.

It may be remarked that

4 becomes PERPENDICULAR, HORIZONTAL, OBLIQUE.

5 becomes HORIZONTAL and OBLIQUE.

6 becomes PERPENDICULAR and OBLIQUE.

The Two past interesting Views will sufficiently impress
the necessity for knowing the Distinction between Situation
and Position, and by what Rule each is governed, seeing

THAT

The PERPENDICULAR POSITION has to express 3 Situations.

HORIZONTAL.....3

OBLIQUE......5

That ONE SITUATION becomes all Three POSITIONS ;

TWO OTHERS become, each of them, TWO ;
And, that ONE becomes a Point, vis. Situation Fourth, Variation Fifth.