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

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derate diligence, suppose, for an hour daily, a few weeks
will be sufficient to gain a thorough knowledge of this
Section.

Sec. 2. The Rules of Proportion, Position, and Lines,
are short; but the application of them will require some
regular practice.

The Drawing, page 59, should first be gone through,
referring to, and applying to the rules, till they can be
very readily performed. Then let the rules be given, and
the Drawing be copied on another paper, the size of the
engraving ; and once more after this, on a different scale.

Copy in the same manner from a new and easy subject
prepared for the purpose ; proceeding orderly by the rules
till they are well remembered and expeditiously applied;
which, with attention, may be acquired in as short a time
as the former Section.

Sec. 3. As the very same manner is used in copying
from nature as from a drawing, it should be practised
as soon as the last Section is understood. Chuse the
most distinct, plain, easy subject: Of buildings for ex-
ample ; let the rules direct all the process, and let it be
gone through exactly as in the former, remembering
that, at present, the minute parts are not to be regarded ;
Proportion, Position, and General Lines only are the
intention.