Washington, DC: Smithsonian Institution, 1959. Softcover. VG contents; light rubbing to spine; a bit of age soiling to covers.. Cream/fawn stapled wraps with cog image and dark lettering. Paginated from 81-112 with 22 bw illus. Paper 6 from Contributions from the Museum of History and Technology; United States National Museum Bulletin 218. "Ancestor of the mechanical clock has been thought by some to be the sundial. Actually these devices represent two different approaches to the problem of timekeeping..." This study and its findings were used in preparing the museums hall on the history of timekeeping, tracing back through 2,000 years of history on 3 continents. (Inventory #: 155112)
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