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Einsteinians safely discussing the story of Einstein being a Newtonian
in 1911 and then becoming an Einsteinian in 1915:

http://blogs.discovermagazine.com/cosmicvariance/2009/07/22/gravity-and-light/
"One of the most interesting predictions of Einstein's new theory of
relativity was that gravity would cause light to bend." I think it is
worth mentioning that the bending of light due to gravity was NOT a
prediction of general relativity. As early as 1704 in his Opticks,
Newton predicted the effect. However, the speed of light was not known
a the time (or even whether it was finite) so no quantitative
prediction could be made. This was rectified by the end of the 18th
century and the Newtonian calculation could be made, though
experimental limitations forbade any test at the time. In 1911
Einstein applied his early ideas of relativistic gravity to the
problem and got the same answer as the Newtonian model. In 1915, when
his theory was approaching completion, he realised the earlier
calculation was wrong, and the deviation of light should be twice the
Newtonian value."

Then a very bad person (me) enters the discussion and informs
Einsteinans that the Pound-Rebka experiment confirms Einstein the
Newtonian and refutes Einstein the Einsteinian:

http://blogs.discovermagazine.com/cosmicvariance/2009/07/22/gravity-and-light/
"In 1911 Einstein said that the speed of light varied with the
gravitational potential V in accordance with the equation c'=c(1+V/
c^2), which was in fact a prediction of Newton's emission theory of
light. In 1915 he added a factor of two and the equation became
c'=c(1+2V/c^2). The problem was (and still is) that the 1911 equation
is consistent, and the 1915 equation INCONSISTENT, with the
gravitational redshift factor 1+V/c^2 experimentally confirmed by
Pound and Rebka."

However in Einsteiniana drawing the attention to the fact that the
Pound-Rebka experiment is compatible with Newton's emission theory of
light and incompatible with Divine Albert's Divine Theory always makes
Einsteinians exercise themselves in crimestop:

http://www.liferesearchuniversal.com/1984-17.html#seventeen
George Orwell: "Crimestop means the faculty of stopping short, as
though by instinct, at the threshold of any dangerous thought. It
includes the power of not grasping analogies, of failing to perceive
logical errors, of misunderstanding the simplest arguments if they are
inimical to Ingsoc, and of being bored or repelled by any train of
thought which is capable of leading in a heretical direction.
Crimestop, in short, means protective stupidity."

Pentcho Valev wrote:

The speed of light emitted downwards with initial speed c (relative to
the emitter) varies with the gravitational potential (phi) in
accordance with one of the following equations:

(1) c' = c(1+(phi)/c^2): Einstein's 1911 equation given by Newton's
emission theory of light.

(2) c' = c(1+2(phi)/c^2): Einstein's 1915 equation - the final version
in Einstein's general relativity.

(3) c' = c: Hawking's equation - the speed of light does NOT vary with
the gravitational potential.

The frequency of light emitted downwards with initial frequency f
varies with the gravitational potential (phi) in accordance with the
equation:

f' = f(1+(phi)/c^2)

This equation is compatible with (1) and incompatible with (2) and
(3). It was confirmed experimentally by Pound and Rebka in 1960.

Generally Einsteiniana presents the Pound-Rebka experiment as a
glorious confirmation of Divine Albert's Divine Theory but sometimes
Einsteinians make fun of believers by teaching confusing ideas:

http://groups.google.com/group/sci.physics.relativity/msg/44abc7dbb30db6c2

John Norton: "THE MICHELSON-MORLEY EXPERIMENT IS FULLY COMPATIBLE WITH
AN EMISSION THEORY OF LIGHT THAT CONTRADICTS THE LIGHT POSTULATE."

Tom Roberts (an Einsteinian famous on sci.physics.relativity): "Sure.
The fact that this one experiment is compatible with other theories
does not refute relativity in any way. The full experimental record
refutes most if not all emission theories, but not relativity."

Pentcho Valev: "THE POUND-REBKA EXPERIMENT IS FULLY COMPATIBLE WITH AN
EMISSION THEORY OF LIGHT THAT CONTRADICTS THE LIGHT POSTULATE."

Tom Roberts: "Sure. But this experiment, too, does not refute
relativity. The full experimental record refutes most if not all
emission theories, but not relativity."

Pentcho Valev
pvalev@yahoo.com