## 170.Of the Shadows of a ſmall Light. Prob . IV.

107. To find the Perſpective of the Shadow of a
Point, whoſe Seat, and Height, above the Geometri-
cal Plane is known.

Let Z be the Geometrical Plane, A the Seat
of the given Point; and C that of the Light: Draw the indefinite Line C A B; and about C,
as a Center, with a Semidiameter equal to the
Height of the Light above the Geometrical
Plane, deſcribe the Arc F: Again, about the
Point A, with a Semidiameter equal to the
Height of the given Point, deſcribe the Arc E. This being done, draw the Line E F touching
the ſaid two Arcs, and cutting the Line C A in
B. Then if the Perſpective of B be found, the
Perſpective of the Shadow of the Point will be
had.

Fig. 59.

## 171. Problem V.

108. To find the Perſpective of the Shadow of an
elevated Point, the Repreſentation of which, as alſo
of its Seat being known, without uſing the Geometri-
cal Plane.

The Operation of Prob. 3. for Solar Sha- dows muſt be uſed here, with this Difference; that inſtead of the accidental Point of the Sun’s
Rays, the Perſpective of the ſmall Sight muſt
be uſed; and in the Room of the accidental
Points of the Directions of the ſaid Rays, the
Perſpective of the Seat of the Light muſt be
aſſumed.

104.

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