_A ~Dorick~ Pedestal, with the Manner of shunning a Difficulty, which
occurs in putting the same in Perspective._
In this Figure a Difficulty arises, which is this; That the Plan A put
in Perspective in C, is so foreshorten’d, that one can’t see distinctly,
where to place the Compasses, for transferring the Perpendiculars on
the shadow’d Pedestal; which is caus’d by the too near Approach of the
horizontal Line to the Ground-line. For avoiding this Difficulty, draw
another Ground-line as much below the first as you please, and carry the
Breadth and Length thereon, after the usual manner, still keeping the
same Points of Sight and Distance O and F: And according to the Removal
of the Ground-line, the Plans will be more or less distinct; as you see
the Plan E is more distinct than D, and D is more so than C.