I've read the Einstein digital papers, and note that Einstein referred to a gravitational field as a pace where space was "neither homogeneous nor isotropic". He also referred to a varying speed of light, and light refracting downward like any wave moving through a medium where there's an orthogonal gradient in wave speed.

Other old papers make me think that an electromagnetic field is a place where space is curved, or twisted if you prefer, electromagnetism being associated with twist and turn. I can find old references to eg Maxwell talking about a transverse undulations and a screw mechanism, but I can't find any contemporary references. Can anybody point to any?

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