Prob. III.
Draw the Line F T L, parallel to a b, through
the accidental Point T of the Lines perpendicu-
lar to the Geometrical Plane; and at the Point
T, raiſe the Perpendicular T G, which make e-
qual to the Diſtance of the Eye from the per-
ſpective Plane; then draw the Line G L, or
G F, ſo that the Angle T L G, or T F G, be e-
qual to the Angle of the Inclination of the given
Lines; and the Point L, will be the Accidental
Point ſought, if the given Lines incline to-
wards b; but if they incline towards a, F will
be the Accidental Point.
the accidental Point T of the Lines perpendicu-
lar to the Geometrical Plane; and at the Point
T, raiſe the Perpendicular T G, which make e-
qual to the Diſtance of the Eye from the per-
ſpective Plane; then draw the Line G L, or
G F, ſo that the Angle T L G, or T F G, be e-
qual to the Angle of the Inclination of the given
Lines; and the Point L, will be the Accidental
Point ſought, if the given Lines incline to-
wards b; but if they incline towards a, F will
be the Accidental Point.