Hooper sets out to explain the physical cause of gravity, which Newton left unsolved, by means of the universal ether then believed to fill space. He works through matter, energy, heat and light as modes of motion, electricity and magnetism, and Newton’s and Kepler’s laws, quoting Faraday and other physicists at length.
A document of physics just before relativity did away with the ether, interesting to historians of science, not a guide to current physics. Download the free EPUB.