Gravesande, Willem Jacob 's
,
An essay on perspective
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18
x
The PREFACE.
Perſpective
was
not
neglected
.
He
has
car-
ried
the
Matter
farther
than
could
have
been
reaſonably
expected
from
one
ignorant
of
Mathematicks
;
and
I
am
indebted
to
him
for
ſeveral
Obſervations
,
which
I
my
ſelf
ſhould
perhaps
have
never
thought
on
.
ERRATA
.
Page
74
.
1
.
17
.
for
x
,
r
.
in
X
.
P
.
83
.
1
.
28
.
for
that
,
r
.
that
for
.
P
.
88
.
1
.
8
.
for
Tube
,
r
.
Table
.
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