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

108

02s PERSPECTIVE. [lECT, II L

PLATE XXXVI.

WHEN THE SUN IS IN THE PLANE OF THE

PICTURE.

Figure 1. H L is the horizontal line. The fha-
dow falls to the right hand. The rays of the fun
being parallel we muft in the firft place determine
its elevation in the heavens, and affume the direc-
tion of its rays accordingly, as R. The fun being in
the plane of the picture, the fhadows it occafions are
parallel to the ground line, fo that we need only
procure their lengths by interfeclions parallel to
thofe ravs.

From the bottom of the houfe, A, rule a line pa-
rallel to the ground line ; to cut this line for the
fhadow of B, rule from B a line parallel to the radial
line, as R B, which gives a for the fhadow of B.

The fide B, F, vanifhing in L, fo does its fhadow
af: or, the point/is equally found by ruling a ho-
rizontal line from the. feat of F, cut by a radial
parallel to R.

Figure 2. The fame procefs; the fhadow falling
to the left hand. Rule A 1, horizontally, which is
cut by the radial B 1 ; let fall D to C ; rule C 2 ho-
rizontal, which is cut by the radial D 2. Rule
E3, horizontal, which is cut by the radial F 3: unite
1, 2, 3, to complete the fhadow of B, D, F. 3, ruled
to L, gives the fhadow of the further fide of the
roof of the houfe.

PLATE