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

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cumference as r, find its seat, rule it to C, ereCt a line,
he. as before, and it gives S by its interse&ion with r
C.
The shadow on the inside the cylinder, is found as
before ; parallel to C M rule a t, and b I; rule / C, / C,
which intersered by a M, b M, give n m for the course
os the shadow. To find the shadow of this object on the
ground ; procure the seat of i as at h ; rule h H, and I
M ; their interseCtion is hint sufficient. The ressection
is merely a counterpart.
No. IV. Shews that however the rays from objects,
he. and their ressections may appear to differ, yet in
reality they are exaCtly Similar : so that, the supposed
ressedtive depth in the water of C D, and E F, is equal
in appearance to the distance between those objects and
the radial interseCtions.
No. V. If the little figure Handing on the hill, was
supposed to with to represent the ressections, he. of these
houses, he would be able to shew but a very Small part
of them, as in faCt he sees little beside the house E and
the tower D : which Ihews the necessity of a good Sta-
tion from which objeCts may appear piCturesque.
No. VI. Exhibits a variety of objects whose ressec-
tions explain themselves, being exaCt counterparts. Of
the slicks D, and E, the first being upright, its ressec-
tion is upright also : but E being assant, that part of
it which is under the water, becomes refrassed by the
denser medium, and see ms as it were broken, so that
although it is a good rule to consider water as a mirror,
yet by its transparency, it Sometimes differs in its effeCE
"End of the Plates of Perspective.