  In 1918, H. Weyl proposed a unified theory of gravity and electromagnetism
based on a generalization of Riemannian geometry. With hindsight we now could
say that the theory carried with it some of the most original ideas that
inspired the physics of the twentieth century. In a book published in 1927,
Bertrand Russell devoted an entire chapter to explain and give a critical
appraisal of Weyl's theory. We briefly revisit the text written by Russell, who
gave one of the first philosophical approaches to Weyl's ideas.
