488
DOC.
47 THE RELATIVITY PRINCIPLE
this
equation.
See also Einstein 1908b
(Doc.
49),
p.
99.
[103]
In
a
reprint copy (see
note
34),
Einstein
corrected the second
"="
to
"-."
[104]
This
is
Einstein's
first discussion
of
the
gravitational deflection
of
a light ray.
[105]
See
Pound and Rebka 1960
for
the first
terrestrial confirmation
of
the
gravitational
red
shift
of
spectral
lines.
[106]
In
a reprint copy
(see
note
34),
Einstein
corrected the
"u"
preceding
X
to "ue," and the
"u"
preceding
Z to
"uc."
See also Einstein
1908b
(Doc.
49),
p.
99.
[107]
The corrections
described in the
preced-
ing
note
apply
here
as
well.
[108]
In
a reprint copy (see
note
34),
Einstein
corrected
"-" to "+" in the
equation on
this
line. See also Einstein
1908b
(Doc. 49),
p.
99.
"u" should
be
"na."