Method III.
30.
To demonſtrate this, draw the Line A B
perpendicular to the Baſe Line; O V perpendi-
cular to the Horizontal Line; and A C, O H
perpendicular to the Tangent H C. All theſe
Perpendiculars will cut the Lines to which they
are perpendicular, in the Points wherein theſe
laſt touch the Circle L B C, or H V I. Like-
wiſe draw the Line A E from the given Point
A, to the Point E, wherein the Line H C cuts
the Baſe Line. Finally, draw O D, from the
Eye O to the Point D, wherein the ſaid Line
HC cuts the Horizontal Line.
perpendicular to the Baſe Line; O V perpendi-
cular to the Horizontal Line; and A C, O H
perpendicular to the Tangent H C. All theſe
Perpendiculars will cut the Lines to which they
are perpendicular, in the Points wherein theſe
laſt touch the Circle L B C, or H V I. Like-
wiſe draw the Line A E from the given Point
A, to the Point E, wherein the Line H C cuts
the Baſe Line. Finally, draw O D, from the
Eye O to the Point D, wherein the ſaid Line
HC cuts the Horizontal Line.