360
DOC.
42
SPECIAL AND
GENERAL RELATIVITY
116
Relativity
only
two
deductions
from
the
theory
which admit of
being
tested
by
observation,
to
wit,
the
curvature
of
light rays
by
the
gravitational
field
of the
sun,1
and
a
displacement
of the
spec-
tral
lines of
light reaching
us
from
large
stars,
as
compared
with the
corresponding
lines
for
light produced
in
an
analo-
gous
manner
terrestrially
(i.e. by
the
same
kind of
atom).2
These
two
deductions
from
the
theory
have both been
con-
firmed.
[65]
[66]
[67]
[68]
[69]
[70]
1
First observed
by
Eddington
and others
in 1919. (Cf.
Appendix 3,
pp.
145-151).
2 Established
by
Adams
in 1924. (Cf.
p. 151).