DOI Page / Citation link:
https://doi.org/10.11588/diglit.25683#0076
48
PRACTICAL PERSPECTIVE,
nate in the edge of the ridge: draw A C towards the point Va and let it be terminated by
BC drawn towards the point j Su2n bj; then C is in the edge of the shadow of the ridge
which by maxim 2nd will fend towards C, the point of sight.
The shadows of the upright and horizontal paling will be easily understood byrefering
to the preceeding maxims.
(SHADOWS No 3. The Sun before the Spectator.)
In No. 3‘ the sun is supposed to be before the spectator, and the shadows will in every
respect be determined by operations similar to those in the last examples, except that the
sun is above the horizontal line instead of being below it, and that every line of shadow'
will tend from its vanishing point instead of towards it.
Having determined the solar point in the horizontal line, raise on it a perpendicular,
and fix the point 3 Sun, which will denote the elevation of that luminary.
It would be impertinent and unnecessary to describe the operations for all the shadows
in this example. They are determined according to the preceeding maxims; and there fare,
those of the upright objects received on the ground or other level planes tend from the
solar point The left side of the church tends to the vanishing point Yl, and the shadow s
which are perpendicular to it, or (which is the same thing) of those which tend to V2,
have their tendency from the point Si, where a ray drawn from V2 intersects the vanishing
line of surfaces parallel to that side of the church;, by maxim 1. The level style of the
dial and the beam of the shed M will have the same tendency: the shadow of the oblique
part, of the style tends also from a point in the same vanishing line. The shadow of the
shed on the church and on the ground will have various vanishing points according to the
surfaces that receive it; ail of which may be determined by the preceeding maxims.
The roof of the body of the church slopes with an elevation towards V3. Iherefore
its vanishing line being drawn will give S3 on the solar perpendicular for the point from
which the shadows of perpendicular objects will be directed on the roof. '! he roof of the
shed has the vanishing point of its sloping lines in V4, therefore by a similar operation
the point S4 is found on tiie solar perpendicular for the shadows of upright lines or objects
upon it.
PRACTICAL PERSPECTIVE,
nate in the edge of the ridge: draw A C towards the point Va and let it be terminated by
BC drawn towards the point j Su2n bj; then C is in the edge of the shadow of the ridge
which by maxim 2nd will fend towards C, the point of sight.
The shadows of the upright and horizontal paling will be easily understood byrefering
to the preceeding maxims.
(SHADOWS No 3. The Sun before the Spectator.)
In No. 3‘ the sun is supposed to be before the spectator, and the shadows will in every
respect be determined by operations similar to those in the last examples, except that the
sun is above the horizontal line instead of being below it, and that every line of shadow'
will tend from its vanishing point instead of towards it.
Having determined the solar point in the horizontal line, raise on it a perpendicular,
and fix the point 3 Sun, which will denote the elevation of that luminary.
It would be impertinent and unnecessary to describe the operations for all the shadows
in this example. They are determined according to the preceeding maxims; and there fare,
those of the upright objects received on the ground or other level planes tend from the
solar point The left side of the church tends to the vanishing point Yl, and the shadow s
which are perpendicular to it, or (which is the same thing) of those which tend to V2,
have their tendency from the point Si, where a ray drawn from V2 intersects the vanishing
line of surfaces parallel to that side of the church;, by maxim 1. The level style of the
dial and the beam of the shed M will have the same tendency: the shadow of the oblique
part, of the style tends also from a point in the same vanishing line. The shadow of the
shed on the church and on the ground will have various vanishing points according to the
surfaces that receive it; ail of which may be determined by the preceeding maxims.
The roof of the body of the church slopes with an elevation towards V3. Iherefore
its vanishing line being drawn will give S3 on the solar perpendicular for the point from
which the shadows of perpendicular objects will be directed on the roof. '! he roof of the
shed has the vanishing point of its sloping lines in V4, therefore by a similar operation
the point S4 is found on tiie solar perpendicular for the shadows of upright lines or objects
upon it.