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

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To those of our readers who may not
have at hand a pi aster figure proper to elucidate
the principles of forefoortening, we recommend
the inspe&ion os a coach wheel, as a simple
instance in point. In looking at the wheel in
front, all the spokes seem equal and alike j but
in an oblique view, they are greatly changed :
the uprights preserving their dimensions, while
those on each side are apparently lesiened, in
proportion to their nearness to the horizontal
spokes i which are more foresbortened than any
others.
st4T The peculiarity os the planetary sha-
dows is, their diminution as they are pro-
longed ; for the sun being very superior in
size and extent, the shadows of such bodies
(as of our earth for instance) is constantlv con-
verging, till, at length, they terminate in a
point: So that the rays of the sun are not
abjolutely parallel in themselves, though parallel
for every purpose of perspedlive.
§§§ The principles generally adopted in the
Lectures, are those of Dr. Brook Taylor.

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