Sir Arthur & Gravity is a book in two parts with an Addendum. Part One makes the physics of Sir Arthur Stanley Eddington available to the general scientific reader. Part Two develops and describes new research into field theory, using Eddington as a foundation. There is a treatment of gravitation in relation to electricity which is both original and useful. The Addendum, titled "Understanding Gravitational Forces," is a powerful, readable and detailed account of gravitation in classical physics, and of modern research into the problem of gravitational field control.