The Artist's Repository, Or, Encyclopedia of the Fine Arts (Band 2): Perspective, Architecture (London, 1808)

LECT. III.] ON PERSPECTIVE.

Ill

PLATE XXXIX.

IN THE FOLLOWING EXAMPLES THE SUN IS BEFORE THE

PICTURE.

H is the feat of the fun on the Horizontal Line.

A is the vanifhing point of the rays of light; or,
the fuppofed place of the fun on the horizontal plane.

No. L Is a cube erect; the lines from its upper
corners are ruled to A, as a b •> thofe from its bot-
tom corners, are ruled to H, as ccff: their inter-
fediions determine the Ihadow, 12 3.

No. II. Is treated on the principles of No. II. in
Plate XXXVIII. by finding the feat of its ex-
tremes, and ruling radials to A, as a and c; inter-
fered from H as b and d.

No. III. Is an application of the fame method
to a flight of fteps; whofe bottom corner, c, is ruled
to H, and the top of the fame ftep to A, interfering
at 1. The feat of the fecond ftep is found at b,
which, ruled to H, is cut at 2 ; the feat of the third
ftep is at a, which is cut at 3 ; 4 is the interferon
of the feat of the further end of the fame face, which
is found by letting fall a perpendicular from g, inter-
fered by a C ; in the fame manner, is found, the feat
of t; which likewife ruled to H, completes the
(hadow on the ground. The fhadows of the higher
fteps on the lower are alfo ruled to H.

The fhadow of the ftick A is ruled to H, till it
meets the ftep, whofe perpendicular courfe it then
follows; on the horizontal part of the ftep, it is
again Tuled to H; the (hadow of its head, ruled to
A, completes the whole.

p 2 PLATE