Howard, Frank: The sketcher's manual: or, the whole art of picture making reduced to the simplest principles by which amateurs may instruct themselves without the aid of a master (London, 1841)

Section II.

REGULATIONS FOR THE USE OF THEM.

What particular forte points may be made use
of, will depend upon the character and disposition
of the subject; but one general rule must be
observed, viz., not to use two corresponding points
in the same drawing ; so that a tree occupying the
point obtained by the first intersections, a figure
introduced to give effect in the same drawing,
should occupy a point obtained by the subdivi-
sions (Plate XXII. fig. 1); and, as the scene is
more or less extensive, and as the object
introduced to give effect, is smaller or larger
in proportion to the whole drawing, so may the
points, more or less distant from the centre, be
used.

The horizon, which always has great influence
over the character of a drawing, should not vary
much beyond one-third or two-fifths of the whole

eght of the drawing. In proportion as the