An alternative rendering of the theory of relativity by a distinguished English mathematician and philosopher. Three-part treatment presents an overview of general principles, mainly philosophical in character; describes physical applications and the results deducible from the formulas assumed for the gravitation and electromagnetic fields; presents an exposition of the elementary theory of tensors. Unabridged republication of the edition published by Cambridge University Press, Cambridge, 1922.
Here's a sample of other books in this Dover category
The Theory of Relativity by R. K. Pathria Graduate-level text elaborates on physical ideas underlying relativity, examining special theory (space-time transformations, four-dimensional formulations, mechanics, optics, electromagnetism), and general theory (space-time continuum, gravitation, experiments, and relativistic cosmology). 1974 edition.
The Unity of the Universe by D. W. Sciama This accessible approach uses compelling photos, figures, and examples to address and answer profound questions about the universe. "An engrossing book, an invigorating intellectual exercise." — Scientific American. 1959 edition.