DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19574#0089
BUT 7S
do not in their breadth fubtend an arch of more than eighteen
degrees, are the beft of all others.
As the furface of a mirror, which is a fegment of a larger
fphere, receives more rays than another of a lefs ; if the breadth
of each fubtend an arch of eighteen decrees, or even more or
lefs, provided it be equal, the effects of the larger mirror will
be greater than thofe of the lefTer. And, as the focus is con-
tained between the fourth and fifth part of the diameter, mir-
rors that are fegments of greater fpheres will burn at a greater
diftance, than thofe which are fegments of the lefier.
And iince the burning depends upon the uniting or union of
the rays on the concave, fpherical figure; it is not to be wondered
at, that even wooden mirrors gilded, or fuch as are prepared
of alabafter, he. covered with gold, nay even fuch as are made
of paper, and covered with ftraw, mould be found to burn.
BURNISHING, is the art of fmoothing or polifhing a body
by a violent rubbing it with any thing.
Thus book-binders burnifh the edges of their books by rub-
bins: them with a doer's tooth. Gold and filver are burnifhed
with a wolf's tooth, a dog's tooth, the blood-ftone, tripoli, a
piece of white wood and emery.
BURNISHER, a round polifhed piece of fteel, ferving to
fmooth and give a luftre to metals.
BUST ( [in fculpture, &c.] a term ufed for the portrait
BUSTO j or figure of a perfon in relievo; fhewing only
the head, moulders, and ftomach, the arms being lopped off,
ufually placed on a pedeflal or confole.
The Buft is the fame that the Latins called Herma, from
the Greek Hermes, Mercury; the image of that god being fre-
quently reprefented in this manner by the Athenians.
Buft is alfo ufed, efpecially by the Italians, for the trunk of
an human body, from the neck to the hips.
BUSTLER was a Dutchman, both a hifrory and face
painter in the reign of king Charles II. There is a good pic-
ture, partly performed by him, in Mr. Elfum's poffemon and
was formerly, which confifts of three boors playing together in
different actions by Mr. Buftler, a good landfcape behind by
Mr. Lanckrinck, and a little dog on one fide by Horidius.
Hbzv to take the imprcjjion of any BUTTERFLY in a mi-
nute in all colours. Kill the Butterfly, but take care not to in-
jure the wings, but fpread them open in a flying manner as ex-
actly as may be; then take a piece of white paper, and, with
a fmail brum or pencil, wafh a part of the paper with gum-
water, a little thicker than ordinary; fo let it dry leifurely;
then lay the Butterfly on the paper, and, when you have fixed
it well j cut away the body elofe to the wings, and throw it
away;
do not in their breadth fubtend an arch of more than eighteen
degrees, are the beft of all others.
As the furface of a mirror, which is a fegment of a larger
fphere, receives more rays than another of a lefs ; if the breadth
of each fubtend an arch of eighteen decrees, or even more or
lefs, provided it be equal, the effects of the larger mirror will
be greater than thofe of the lefTer. And, as the focus is con-
tained between the fourth and fifth part of the diameter, mir-
rors that are fegments of greater fpheres will burn at a greater
diftance, than thofe which are fegments of the lefier.
And iince the burning depends upon the uniting or union of
the rays on the concave, fpherical figure; it is not to be wondered
at, that even wooden mirrors gilded, or fuch as are prepared
of alabafter, he. covered with gold, nay even fuch as are made
of paper, and covered with ftraw, mould be found to burn.
BURNISHING, is the art of fmoothing or polifhing a body
by a violent rubbing it with any thing.
Thus book-binders burnifh the edges of their books by rub-
bins: them with a doer's tooth. Gold and filver are burnifhed
with a wolf's tooth, a dog's tooth, the blood-ftone, tripoli, a
piece of white wood and emery.
BURNISHER, a round polifhed piece of fteel, ferving to
fmooth and give a luftre to metals.
BUST ( [in fculpture, &c.] a term ufed for the portrait
BUSTO j or figure of a perfon in relievo; fhewing only
the head, moulders, and ftomach, the arms being lopped off,
ufually placed on a pedeflal or confole.
The Buft is the fame that the Latins called Herma, from
the Greek Hermes, Mercury; the image of that god being fre-
quently reprefented in this manner by the Athenians.
Buft is alfo ufed, efpecially by the Italians, for the trunk of
an human body, from the neck to the hips.
BUSTLER was a Dutchman, both a hifrory and face
painter in the reign of king Charles II. There is a good pic-
ture, partly performed by him, in Mr. Elfum's poffemon and
was formerly, which confifts of three boors playing together in
different actions by Mr. Buftler, a good landfcape behind by
Mr. Lanckrinck, and a little dog on one fide by Horidius.
Hbzv to take the imprcjjion of any BUTTERFLY in a mi-
nute in all colours. Kill the Butterfly, but take care not to in-
jure the wings, but fpread them open in a flying manner as ex-
actly as may be; then take a piece of white paper, and, with
a fmail brum or pencil, wafh a part of the paper with gum-
water, a little thicker than ordinary; fo let it dry leifurely;
then lay the Butterfly on the paper, and, when you have fixed
it well j cut away the body elofe to the wings, and throw it
away;