The complete description of over 150 chronometers (including the famous Mudge "Green" as well as chronometers by Arnold, Earnshaw, Berthoud and other famous makers) with an introductory 50-page historical "Chronometrical Chronology," illustrated glossary, full bibliography and index. This is a reference work of incomparable value. (487 illustrations (249 b/w, 142 full color).