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

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Here it may not be improper to introduce some Pro-
gressive Directions for the more speedy acquirement of
the Principles of this Science.

Progressive Remarks, with Reference to the Mode of
Study for each Section.

OF PART THE FIRST.

Sec. i. The three separate, but dependant parts of
linear description, viz. Proportion, Position, and Lines.
The distinction between them ; the properties, names, and
number of each, with their particular description, should
be clearly understood, and impressed on the memory ; and
for this purpose, reading the Section three or four times
over, will in general be sufficient.

Positions and Lines should be practised; and also, the
degrees of Obliquity, beginning first with 45 degrees, pro-
ceeding then to 2 2 and a half, then to 11 and a quarter,
and the intermediate degrees afterwards. Though it is
impossible to give the precise time necessary for every one
to acquire this art, as much depends on application; yet
a general idea may certainly be formed; and, with mo-