The artists repository and drawing magazine: exhibiting the principles of the polite arts in their various branches (3.1789)

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of the spe&ator’s eye; it is, I say, the center
of the horizontal line. But if the plane ly-
ing on the ground, be situate in an obliquedi-
reCtion with respeCt to the speCiator, then that
point on the horizontal line to which it tends
(i. e. its vanishing point) will be removed on
that line, from the center, to one side of it,
according to its obliquity, e. gr. Is it is ten de-
grees oblique from the eye, its point will be ten
degrees distant from the center, and so on.
As an example, I have, you see, laid this
plane of card paper, on this plane of mahoga-
ny, (which represents a portion of the ground
plane immediately before the speCtator) but as
the directions of their sides do not agree, it is
certain they will never arrive at the same point;
but according to the variation of the card pa-
per, from the true point of the drawing-board,
so will it remove its vanishing point on the
horizontal line. But please to observe, that
while it remains on the drawing-board, it may
wish in vain for any other line on which to va~
nish; the original plane has the absolute power
os directing it.
Thus, Ladies and Gentlemen, have we
illustrated the nature of planes, of the hori-
zontal line, and of its center, of the ground plane,
and of vanishing points. What has been said,
has