I have also found this of interest:
In 1920, lecturing at the University of Leiden, on the topic Ether and the Theory of Relativity, Einstein stated outright that the ether did exist, that is was necessary as a medium of transfer because light also had wave-like properties. He even wrote Lorentz to clarify this point.
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I did find that lecture interesting. Thanks for pointing it out. However, Einstein was 1920 referring to the space-time ether of General Relativity.
The translated lecture is here:
http://www-history.mcs.st-and.ac.uk/Extras/Einstein_ether.html
And here is an excerpt I found of Einstein’s letter to Lorentz:
I agree with you that the general relativity theory admits
of an ether hypothesis as does the special relativity
theory. But this new ether theory would not violate the
principle of relativity. The reason is that the state
[...metric tensor] = Aether is not that of a rigid body in an independent state of motion, but a state of motion which is a function of position determined through the metrical phenomena.
“The translated lecture is here:”
Yes, I remember reading that some years ago.
The older I get, the more aware I am of what I don’t know.
I have spent a number of years working with Anti-magnetism,
and have formed a few opinions from my observations.
I suspect magnetic force is a function of time, where as gravity is a function of comparative velocities.