DOI Page / Citation link:
https://doi.org/10.11588/diglit.19575#0272
150 S H A
rt Sgfafficiata, fcratch-work, or the Greek y^v. It is ufed
to fignify a method of painting with black and white only, not
In frefco j yet fitch as will bear the weather. Sgrafit is both
file Jefign and the painting ail in one ; it is chiefly ufed to em-
bellifh the fronts of oalaces, and other magnificent buildings.
See SCRATCH-WORK. '
S, G. S. fignib.es Simon Guillain, fculptor. This artift, who
was born in Paris, engraved eighty different figures of Hannibal
Caracci, 3:11101646.
SHADOW is a plan, where the light is weakened by the
inferpofition of fome opaque body before the luminary.
Shadow, in optics, is a privation of light by the interpofl-
tion of an opaque body.
But, as nothing is feen but by a light, a mere Shadow is in-
vifible.
When, therefore, we fay, we fee a Shadow, it is partly that
we fee bodies placed in the Shadow, and illuminated by light
reflected from collateral bodies, and partly that we fee the con-
fines of light.
If the opaque body, that projects the Shadow, be perpendicular
to the horizon, and the place it is projected on be horizontal,
the Shadow is called a ri°;ht Shadow : Such are the Shadows of
men, trees, buildings, mountains, &c.
If the opaque body be placed parallel to the horizon, the Sha-
dow is called a vcrfed Shadow ; as the arms of a man {{.retched
out, he.
T>rc laws cf the projection of Shadows from opaque bodies.
1. Every opaque body projects a Shadow in the fame direction
with its rays ; that is, towards the part oppofite to the light-
Hence, as cither the luminary or the body changes place, the
Shadow likewiie changes.
2. Every opaque body projects as many Shadows, as there are
luminaries to enlighten it.
3. As the light of the luminary is more intenfe, the Shadow
is the deeper. Hence the intenfity of the Shadow is meafured
by the degrees of light, that fpace is deprived of-
4. If a luminous fphere be equal to an opaque one it illumi-
nates, the Shadow, which this latter projects, will be a cylinder,
and confequemlv will be propagated ftill equal to itfelf, to what-
ever diftance the luminarvis capable of acting; fo that, if it be
cut in any place, the plane of the fection will be a circle, equal
to a great circle of the opaque fphere.
5. If the luminous fphere be greater than the opaque one, the
Shadow will be conical. If therefore the Shadow be cut by a
plane, parallel to the bafe, the plane of the fection will be a
circle, j
rt Sgfafficiata, fcratch-work, or the Greek y^v. It is ufed
to fignify a method of painting with black and white only, not
In frefco j yet fitch as will bear the weather. Sgrafit is both
file Jefign and the painting ail in one ; it is chiefly ufed to em-
bellifh the fronts of oalaces, and other magnificent buildings.
See SCRATCH-WORK. '
S, G. S. fignib.es Simon Guillain, fculptor. This artift, who
was born in Paris, engraved eighty different figures of Hannibal
Caracci, 3:11101646.
SHADOW is a plan, where the light is weakened by the
inferpofition of fome opaque body before the luminary.
Shadow, in optics, is a privation of light by the interpofl-
tion of an opaque body.
But, as nothing is feen but by a light, a mere Shadow is in-
vifible.
When, therefore, we fay, we fee a Shadow, it is partly that
we fee bodies placed in the Shadow, and illuminated by light
reflected from collateral bodies, and partly that we fee the con-
fines of light.
If the opaque body, that projects the Shadow, be perpendicular
to the horizon, and the place it is projected on be horizontal,
the Shadow is called a ri°;ht Shadow : Such are the Shadows of
men, trees, buildings, mountains, &c.
If the opaque body be placed parallel to the horizon, the Sha-
dow is called a vcrfed Shadow ; as the arms of a man {{.retched
out, he.
T>rc laws cf the projection of Shadows from opaque bodies.
1. Every opaque body projects a Shadow in the fame direction
with its rays ; that is, towards the part oppofite to the light-
Hence, as cither the luminary or the body changes place, the
Shadow likewiie changes.
2. Every opaque body projects as many Shadows, as there are
luminaries to enlighten it.
3. As the light of the luminary is more intenfe, the Shadow
is the deeper. Hence the intenfity of the Shadow is meafured
by the degrees of light, that fpace is deprived of-
4. If a luminous fphere be equal to an opaque one it illumi-
nates, the Shadow, which this latter projects, will be a cylinder,
and confequemlv will be propagated ftill equal to itfelf, to what-
ever diftance the luminarvis capable of acting; fo that, if it be
cut in any place, the plane of the fection will be a circle, equal
to a great circle of the opaque fphere.
5. If the luminous fphere be greater than the opaque one, the
Shadow will be conical. If therefore the Shadow be cut by a
plane, parallel to the bafe, the plane of the fection will be a
circle, j