Good enough history of the art of clock and watch making, but it lacks the simple directness of Ilin's What Time Is It? -- on a younger level- and could have been better. It includes interesting bits of information that will appeal to the hobbyist and the professional, but the general reader will find it dull going. Various types of mechanisms are described in the general sort of way that requires considerable powers of visualization on the reader's part. Haphazard organization results in a feeling of shuttling back and forth in time, so the sense of historical continuity is lost. While this book may have some sale for the collector or the reader interested in watchmaking, it wont have a general appeal.