DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19949#0030
26
OF T11E DOWN-HILL VIEW.
the nearer edge; it will then be found that the lower and
more, remote edge of the plane will appear higher on the
ruler than the nearer one, the lower edsre bein£ seen
at a, the upper edge at b. Merely, however, to draw
two horizontal and parallel lines across the paper, for the
purpose of representing a descending plane by the space
between them alone, without the assistance of other lines
in contrast with them, would be impossible ; but whenever
the descending plane is visible, the effect of descent can
be readily conveyed by means of auxiliary lines on the
surface of that plane, assisted by a judicious use of light
and shade.
Again;—let the sketeher suppose himself on a hill
descending directly from him, and that a yard or two
m advance of him a line is drawn across the road parallel
to his position, and another line a few yards further down
parallel to the first; it would be found, on holding a
pencil upright at a little distance from the eye, so as
to appear to cut both lines, and on looking at them with
one eye closed, that the lower line of the descent would
cross the pencil transversely at a higher point than
would the upper and nearer line.
In this example (Fig. 10), the spectator is supposed to
be on such a hill, having the vanishing line L L of the
descending plane, and the horizontal vanishing line H H,
in their proper positions. Then all lines on the descend-
ing plane, or parallel with it,—-as the timber, the marks of
OF T11E DOWN-HILL VIEW.
the nearer edge; it will then be found that the lower and
more, remote edge of the plane will appear higher on the
ruler than the nearer one, the lower edsre bein£ seen
at a, the upper edge at b. Merely, however, to draw
two horizontal and parallel lines across the paper, for the
purpose of representing a descending plane by the space
between them alone, without the assistance of other lines
in contrast with them, would be impossible ; but whenever
the descending plane is visible, the effect of descent can
be readily conveyed by means of auxiliary lines on the
surface of that plane, assisted by a judicious use of light
and shade.
Again;—let the sketeher suppose himself on a hill
descending directly from him, and that a yard or two
m advance of him a line is drawn across the road parallel
to his position, and another line a few yards further down
parallel to the first; it would be found, on holding a
pencil upright at a little distance from the eye, so as
to appear to cut both lines, and on looking at them with
one eye closed, that the lower line of the descent would
cross the pencil transversely at a higher point than
would the upper and nearer line.
In this example (Fig. 10), the spectator is supposed to
be on such a hill, having the vanishing line L L of the
descending plane, and the horizontal vanishing line H H,
in their proper positions. Then all lines on the descend-
ing plane, or parallel with it,—-as the timber, the marks of