1ſolar rays come: but it is true that by the vivacity of the light, the
ſaid image will appear fringed about with many rays, and ſo will
ſeem to occupie a far greater part of the plate, than really it doth.
And to ſhew that this is true, when you have noted the particular
place of the plate from whence the reflection cometh, and
ved likewiſe how great the ſhining place appeared to you, cover the
greater part of that ſame ſpace, leaving it only viſible about the
midſt; and all this ſhall not any whit diminiſh the apparent
dor to one that beholds it from afar; but you ſhall ſee it largely
diſpers'd upon the cloth or other matter, wherewith you covered
it. If therefore any one, by ſeeing from a good diſtance a ſmall
gilt plate to be all over ſhining, ſhould imagine that the ſame
would alſo even in a plate as broad as the Moon, he is no leſs
ceived, than if he ſhould believe the Moon to be no bigger than
the bottom of a tub. If again the plate were turn'd into a
rical ſuperficies, the reflection would be ſeen ſtrong in but one ſole
particle of it; but yet by reaſon of its livelineſs, it will appear
fringed about with many glittering rays: the reſt of the Ball would
appear according as it was burniſhed; and this alſo onely then
when it was not very much poliſhed, for ſhould it be perfectly
brightned, it would appear obſcure. An example of this we
have dayly before our eyes in ſilver veſſels, which whilſt they are
only boyl'd in the Argol and Salt, they are all as white as ſnow, and
do not reflect any image; but if they be in any part burniſh'd, they
become in that place preſently obſcure: and in them one may ſee the
repreſentation of any thing as in Looking-glaſſes. And that
to obſcurity, proceeds from nothing elſe but the ſmoothing and
plaining of a fine grain, which made the ſuperficies of the ſilver
rough, and yet ſuch, as that it reflected the light into all parts,
whereby it ſeemed from all parts equally illuminated: which
ſmall unevenneſſes, when they come to be exquiſitely plained by
the burniſh, ſo that the reflection of the rays of incidence are all
directed unto one determinate place; then, from that ſame place,
the burniſh'd part ſhall ſhew much more bright and ſhining than
the reſt which is onely whitened by boyling; but from all other
places it looks very obſcure. And note, that the diverſity of
ſights of looking upon burniſh'd ſuperficies, occaſioneth ſuch
difference in appearances, that to imitate and repreſent in picture,
v. g. a poliſh'd Cuirace, one muſt couple black plains with white,
one ſideways to the other, in thoſe parts of the arms where the
light falleth equally.
ſaid image will appear fringed about with many rays, and ſo will
ſeem to occupie a far greater part of the plate, than really it doth.
And to ſhew that this is true, when you have noted the particular
place of the plate from whence the reflection cometh, and
ved likewiſe how great the ſhining place appeared to you, cover the
greater part of that ſame ſpace, leaving it only viſible about the
midſt; and all this ſhall not any whit diminiſh the apparent
dor to one that beholds it from afar; but you ſhall ſee it largely
diſpers'd upon the cloth or other matter, wherewith you covered
it. If therefore any one, by ſeeing from a good diſtance a ſmall
gilt plate to be all over ſhining, ſhould imagine that the ſame
would alſo even in a plate as broad as the Moon, he is no leſs
ceived, than if he ſhould believe the Moon to be no bigger than
the bottom of a tub. If again the plate were turn'd into a
rical ſuperficies, the reflection would be ſeen ſtrong in but one ſole
particle of it; but yet by reaſon of its livelineſs, it will appear
fringed about with many glittering rays: the reſt of the Ball would
appear according as it was burniſhed; and this alſo onely then
when it was not very much poliſhed, for ſhould it be perfectly
brightned, it would appear obſcure. An example of this we
have dayly before our eyes in ſilver veſſels, which whilſt they are
only boyl'd in the Argol and Salt, they are all as white as ſnow, and
do not reflect any image; but if they be in any part burniſh'd, they
become in that place preſently obſcure: and in them one may ſee the
repreſentation of any thing as in Looking-glaſſes. And that
to obſcurity, proceeds from nothing elſe but the ſmoothing and
plaining of a fine grain, which made the ſuperficies of the ſilver
rough, and yet ſuch, as that it reflected the light into all parts,
whereby it ſeemed from all parts equally illuminated: which
ſmall unevenneſſes, when they come to be exquiſitely plained by
the burniſh, ſo that the reflection of the rays of incidence are all
directed unto one determinate place; then, from that ſame place,
the burniſh'd part ſhall ſhew much more bright and ſhining than
the reſt which is onely whitened by boyling; but from all other
places it looks very obſcure. And note, that the diverſity of
ſights of looking upon burniſh'd ſuperficies, occaſioneth ſuch
difference in appearances, that to imitate and repreſent in picture,
v. g. a poliſh'd Cuirace, one muſt couple black plains with white,
one ſideways to the other, in thoſe parts of the arms where the
light falleth equally.
Some write what
they underſtand
not, and therefore
underſtand not
what they write.
they underſtand
not, and therefore
underſtand not
what they write.
Diamonds ground
to divers ſides, &
why.
to divers ſides, &
why.
Silver burniſhed
appears more
ſcuee, than the not
burniſhed, & why.
appears more
ſcuee, than the not
burniſhed, & why.
Burniſh'd Steel
beheld from one
place appears very
bright, and from
another, very
ſcure.
beheld from one
place appears very
bright, and from
another, very
ſcure.
SAGR. If therefore theſe great Philoſophers would acquieſe
in granting, that the Moon, Venus and the other Planets, were not
of ſo bright and ſmooth a ſurface as a Looking-glaſs, but wanted
ſome ſmall matter of it, namely, were as a ſilver plate, onely boyled
in granting, that the Moon, Venus and the other Planets, were not
of ſo bright and ſmooth a ſurface as a Looking-glaſs, but wanted
ſome ſmall matter of it, namely, were as a ſilver plate, onely boyled