This model is missing from the Cornell Collection. This escapement is a variation of the anchor deadbeat escapement of George Graham, who was a partner of the famous English clockmaker, Thomas Tompion (See discussion for X2). The anchor escapement of Robert Hooke and William Clement (c.1675) had a recoil due to the impact of the anchor pallets with the teeth in the escape wheel. Graham designed the teeth and pallets to eliminate the recoil vibrations. [Francis Moon, 2001-00-00] The 220 models in Cornell University’s Reuleaux Collection were built in the late 19th century to demonstrate the elements of machine motion, as theorized by the German engineer Franz Reuleaux. The University acquired the models in 1882 for use in teaching and research. The Reuleaux models are classified according to the alphanumeric schema employed in the catalog of the manufacturer, Gustav Voigt. The letter in a model's ID (e.g., B14 or S35) refers to a class of mechanism; the number is a specific instance of the class. This classification scheme is a simplified version of the taxonomy of machine elements elaborated in Reuleaux's work.
