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http://www.tc.umn.edu/~janss011/pdf%20files/EBms.pdf
Einsteiniana's guru teaching brothers Einsteinians: "The crucial
breakthrough had been that Einstein had recognized that the
gravitational field—or, as we would now say, the inertio-gravitational
field—should not be described by a variable speed of light as he had
attempted in 1912, but by the so-called metric tensor field. The
metric tensor is a mathematical object of 16 components, 10 of which
independent, that characterizes the geometry of space and time. In
this way, gravity is no longer a force in space and time, but part of
the fabric of space and time itself: gravity is part of the inertio-
gravitational field. Einstein had turned to Grossmann for help with
the difficult and unfamiliar mathematics needed to formulate a theory
along these lines."

For brothers Einsteinians the expression "...should not be described
by a variable speed of light as he had attempted in 1912, but..."
could only mean:

"The speed of light in a gravitational field may have been variable in
the past but now it is constant."

Then brothers Einsteinians teach the new truth to the rest of the
world:

http://www.astronomynotes.com/relativity/s4.htm
"Prediction: light escaping from a large mass should lose energy---the
wavelength must increase since the speed of light is constant.
Stronger surface gravity produces a greater increase in the
wavelength. This is a consequence of time dilation. Suppose person A
on the massive object decides to send light of a specific frequency f
to person B all of the time. So every second, f wave crests leave
person A. The same wave crests are received by person B in an interval
of time interval of (1+z) seconds. He receives the waves at a
frequency of f/(1+z). Remember that the speed of light c = (the
frequency f) (the wavelength L). If the frequency is reduced by (1+z)
times, the wavelength must INcrease by (1+z) times: L_atB = (1+z)
L_atA. In the doppler effect, this lengthening of the wavelength is
called a redshift. For gravity, the effect is called a gravitational
redshift."

http://helios.gsfc.nasa.gov/qa_sp_gr.html
"Is light affected by gravity? If so, how can the speed of light be
constant? Wouldn't the light coming off of the Sun be slower than the
light we make here? If not, why doesn't light escape a black hole?
Yes, light is affected by gravity, but not in its speed. General
Relativity (our best guess as to how the Universe works) gives two
effects of gravity on light. It can bend light (which includes effects
such as gravitational lensing), and it can change the energy of light.
But it changes the energy by shifting the frequency of the light
(gravitational redshift) not by changing light speed. Gravity bends
light by warping space so that what the light beam sees as "straight"
is not straight to an outside observer. The speed of light is still
constant." Dr. Eric Christian

The rest of the world used to sing "Yes we all believe in relativity,
relativity, relativity" and "Divine Einstein" but now there is a
financial crisis and the rest of the world does not give a sh-t about
relativity, constant speed of light, variable speed of light etc.
Still brothers Einsteinians get their salaries regularly and are quite
optimistic.

Pentcho Valev
pvalev@yahoo.com