218 x 214 (millimeters, width x depth) 218 x 214 x 483 (millimeters, width x depth x height)
Description:
In this model, a constant torque supplied by a heavy weight, is applied to the toothed escape wheel. The escape wheel transfers energy to the oscillating pendulum each cycle to make up for the losses due to friction. This three-tooth escapement is very old and can be found in the 17th century French book of de la Hire, Traite de Mechanique. The repiprocating mechanism was used to drive a log sawing machine back and forth as the three-tooth wheel rotated. It was also listed in the 19th century book of mechanisms by the American, Henry T. Brown. This escapement was used in the London clock at Westminister (Big Ben) for half a year until it was replaced by a gravity escapement. Its invention is attributed to the English clockmaker Edmund B. Denison in 1851. [Francis Moon, 2003-05-29] 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.
Photography credit: Jon Reis (www.jonreis.com). Jon Reis Photography grants Cornell University Libraries and the Cornell College of Engineering the rights to display copyrighted images of the Reuleux collection of kinetic machines on the Cornell University and National Science Digital Library web sites and for unlimited use in Cornell University Library publications for education purposes only. Rights for all other uses, including but not limited to, editorial, commercial, advertising, web use and display by third parties not affiliated with Cornell University are reserved by the photographer. The written permission of any copyright and other rights holders is required for distribution, reproduction, or other use that extends beyond what is authorized by fair use and other statutory exemptions. Responsibility for making an independent legal assessment of an item and securing any necessary permissions ultimately rests with persons desiring to use the item. For questions about this item or other items please contact the Physical Sciences Librarians at pslref@cornell.edu.
