The subtitle of COMPASS & RULE is “Architecture as Mathematical Practice in England.” Well, not really. The authors, Anthony Gerbino and Stephen Johnston do put forth their perspective on mathematical practice; but the book as a whole is a smorgasbord of topics all loosely related to the practice of architecture in England; and the book as a whole is quite enjoyable and is especially a visual treat. The illustrations are outstanding. It does cover a bit about innovative compasses & rules, but it doesn’t really touch on how they were used. Perhaps the intended audience for this book could be assumed to know such details. Then it wanders into what is essentially an extended aside on the architectural training of King George III, and wraps up with a thorough yet concise description of the architectural development of St. Paul’s Cathedral in London, staring Sir Christopher Wren. In the end, it’s hard to categorize this book, like the smorgasbord.