Book recommendations for learning about Ben Franklin's work in physics?

Benjamin Franklin is one of the most fascinating people in American history, and I'm particularly interested in reading more about his work in physics. I've read his autobiography and a 2002 biography by Edmund S. Morgan. Franklin's autobiography is a classic. Although Morgan's book is informative, it suffers from a bias against other American Founders and an overall lack of focus. I recently started Walter Isaacson's biography, and it's very well-written, but I'm also interested in resources that focus specifically on Franklin's work in physics. Does anyone have book recommendations?