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Ice lubrication for moving heavy stones to the Forbidden City in 15th- and 16th-century China

Jiang Li, Haosheng Chen and Howard A. Stone
Proceedings of the National Academy of Sciences of the United States of America
Vol. 110, No. 50 (December 10, 2013), pp. 20023-20027
Stable URL: http://www.jstor.org/stable/23758104
Page Count: 5
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Abstract

Lubrication plays a crucial role in reducing friction for transporting heavy objects, from moving a 60-ton statue in ancient Egypt to relocating a 15,000-ton building in modern society. Although in China spoked wheels appeared ca. 1500 B.C., in the 15th and 16th centuries sliding sledges were still used in transporting huge stones to the Forbidden City in Beijing. We show that an ice lubrication technique of water-lubricated wood-on-ice sliding was used instead of the common ancient approaches, such as wood-onwood sliding or the use of log rollers. The technique took full advantage of the natural properties of ice, such as sufficient hardness, flatness, and low friction with a water film. This ice-assisted movement is more efficient for such heavy-load and low-speed transportation necessary for the stones of the Forbidden City. The transportation of the huge stones provides an early example of ice lubrication and complements current studies of the highspeed regime relevant to competitive ice sports.

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