Albert Waugh's "Sundials: Their Theory and Construction" is a veritable treasure-house of information on the ancient science of gnomonics. As a dedicated dialist of several years, I never could have achieved such wonderful results without Waugh's classic book. The work presents the art of building sundials from two perspectives: for the advanced dialist, Waugh's book approaches the theory from a highly complex, mathematical viewpoint, including some aspects of celestial mechanics; for the average "do-it-yourself-er", Waugh presents several projects that are simple and well-explained. Accompanying this fine work is a collection of solar tables, astronomical information, and various data of inestimable value that would alone justify the purchase price of the book. So whether your purpose is to further your technical interest in the fascinating science of gnomonics, or merely to build an attractive sundial for your garden over the weekend, "Sundial! s: Their Theory and Construction" should be in your collection. It is considered the very "bible" of dialmaking. I couldn't brag about it more had I written it myself!