Gravesande, Willem Jacob 's
,
An essay on perspective
Text
Text Image
Image
XML
Thumbnail overview
Document information
None
Concordance
Notes
Handwritten
Figures
Content
Thumbnails
Table of Notes
<
1 - 3
[out of range]
>
[Note]
Page: 190
[Note]
Page: 192
[Note]
Page: 192
[Note]
Page: 199
[Note]
Page: 199
[Note]
Page: 199
[Note]
Page: 200
[Note]
Page: 200
[Note]
Page: 201
[Note]
Page: 201
[Note]
Page: 202
[Note]
Page: 202
[Note]
Page: 209
[Note]
Page: 211
[Note]
Page: 212
[Note]
Page: 212
[Note]
Page: 214
[Note]
Page: 214
[Note]
Page: 215
[Note]
Page: 216
[Note]
Page: 216
[Note]
Page: 216
[Note]
Page: 217
[Note]
Page: 217
[Note]
Page: 217
[Note]
Page: 217
[Note]
Page: 217
[Note]
Page: 217
[Note]
Page: 217
[Note]
Page: 218
<
1 - 3
[out of range]
>
page
|<
<
(115)
of 237
>
>|
<
echo
version
="
1.0RC
">
<
text
xml:lang
="
en
"
type
="
free
">
<
div
xml:id
="
echoid-div386
"
type
="
section
"
level
="
1
"
n
="
207
">
<
pb
o
="
115
"
file
="
0191
"
n
="
220
"
rhead
="
on PERSPECTIVE.
"/>
</
div
>
<
div
xml:id
="
echoid-div387
"
type
="
section
"
level
="
1
"
n
="
208
">
<
head
xml:id
="
echoid-head228
"
style
="
it
"
xml:space
="
preserve
">The Height of the Machine above the Table;
<
lb
/>
So is
<
lb
/>
The Glaſſes focal Length,
<
lb
/>
to the
<
lb
/>
Diſtance of the Figure from the Glaſs.</
head
>
<
p
>
<
s
xml:id
="
echoid-s2510
"
xml:space
="
preserve
">Note, The ſaid Diſtance of the Convex Glaſs
<
lb
/>
from the Figure, is meaſured by a Ray, pro-
<
lb
/>
ceeding from the Figure parallel to the Horizon,
<
lb
/>
which is perpendicularly reflected upon the Con-
<
lb
/>
vex Glaſs, by the Mirrour. </
s
>
<
s
xml:id
="
echoid-s2511
"
xml:space
="
preserve
">Note, Moreover, that
<
lb
/>
when we have a Mind to place the Figures out
<
lb
/>
beyond the Back-ſide of the Machine, they muſt
<
lb
/>
be faſtned againſt the Side F of the Board, which
<
lb
/>
muſt be ſo turned, that the ſaid Side be next to
<
lb
/>
the Aperture N.</
s
>
<
s
xml:id
="
echoid-s2512
"
xml:space
="
preserve
"/>
</
p
>
</
div
>
<
div
xml:id
="
echoid-div388
"
type
="
section
"
level
="
1
"
n
="
209
">
<
head
xml:id
="
echoid-head229
"
style
="
it
"
xml:space
="
preserve
">37 Remarks concerning the Repreſentation of Per-
<
lb
/>
ſons Faces.</
head
>
<
p
>
<
s
xml:id
="
echoid-s2513
"
xml:space
="
preserve
">It is certainly very curious and uſeful to de-
<
lb
/>
ſign Perſons Faces to the Life; </
s
>
<
s
xml:id
="
echoid-s2514
"
xml:space
="
preserve
">which by this
<
lb
/>
Machine, may be very well done in Miniature:
<
lb
/>
</
s
>
<
s
xml:id
="
echoid-s2515
"
xml:space
="
preserve
">For if the Face of any known Perſon be thus re-
<
lb
/>
preſented, by only looking at the Appearance,
<
lb
/>
we may very readily know whoſe Face it is,
<
lb
/>
when at the ſame time the Appearance of the
<
lb
/>
Whole Perſon will not take up half an Inch
<
lb
/>
upon the Paper on the Table: </
s
>
<
s
xml:id
="
echoid-s2516
"
xml:space
="
preserve
">But it is very dif-
<
lb
/>
ficult to repreſent a Face diſtinctly as big as the
<
lb
/>
Life; </
s
>
<
s
xml:id
="
echoid-s2517
"
xml:space
="
preserve
">for when we would repreſent a Face in its
<
lb
/>
natural Bigneſs, ſuch a Convex Glaſs as is men-
<
lb
/>
tioned in Numb. </
s
>
<
s
xml:id
="
echoid-s2518
"
xml:space
="
preserve
">35. </
s
>
<
s
xml:id
="
echoid-s2519
"
xml:space
="
preserve
">muſt be uſed, and the Face
<
lb
/>
placed where the Board F is . </
s
>
<
s
xml:id
="
echoid-s2520
"
xml:space
="
preserve
">But the
<
note
symbol
="
*
"
position
="
right
"
xlink:label
="
note-0191-01
"
xlink:href
="
note-0191-01a
"
xml:space
="
preserve
">35.</
note
>
Face which then appears diſtinct enough, that ſo
<
lb
/>
the Perſon whereof it is the Repreſentation may
<
lb
/>
thereby be known, hath not its Lineaments ſuffi-
<
lb
/>
ciently enough repreſented, as to be followed by a
<
lb
/>
Painter as they ought, in order to keep the true </
s
>
</
p
>
</
div
>
</
text
>
</
echo
>