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Ancient Chinese built Forbidden City with stones dragged on ice

[ 2013-11-06 10:12] 來源:中國日報網     字號 [] [] []  
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What's instantly noticeable about the Forbidden City, which served as the home of emperors and their households for almost 500 years since the 15th century, are the enormous white stone foundations supporting the historical site's 980 wooden buildings.

"You go to the Forbidden City and see these massive rocks and you ask yourself: 'How in the world did they ever move this rock here?'" said Thomas Stone of the department of mechanical and aerospace engineering at Princeton University, as quoted by Nature magazine.

Stone is part of a three-person team that recently discovered how. In a report published on Tuesday in the Proceedings of the National Academy of Sciences, they revealed that Chinese architects hauled the rocks from quarries in Fangshan, located 70 kilometers south of downtown Beijing, on wooden sledges along ice roads.

Li Jiang, an expert in mechanical engineering from the University of Science and Technology Beijing and a member of the team that performed the study, found ancient Chinese documents describing how people transported a 120-metric-ton rock to repair three major halls in the Forbidden City in 1557.

The ancient document, Lianggong Dingjian Ji, which translates as "the reconstruction record of two palaces", detailed how workers created man-made ice paths to transport the stone. The process was methodical: every half kilometer, wells were dug to obtain water, which was then poured onto a road and allowed to freeze to reduce the friction between the sledges and the road.

"The 49-cubic-meter rock was hauled to Beijing in four weeks. That is an average speed of about eight centimeters per second," Li said.

Studies comparing the ancient Chinese technique of transporting stone with methods from other ancient civilizations show it is more efficient to drag the sledges rather than to use wooden rollers, as the Assyrians did.

Stone said the team's calculations show that dragging the 120-ton rock with a sledge over ground that was not frozen with ice would have required a labor force of more than 1,500 people. On ice or wet wooden rails, on the other hand, it would have required 330 men. The ancient Chinese practice of hauling stone along an ice road lubricated by water would have needed fewer than 50 men.

Questions:

1. Where did the ancient Chinese get the stone to build the Forbidden City?

2. How were the massive stones hauled to Beijing?

3. How long did it take to haul the 49-cubic-meter rock?

Answers:

1. Fangshan.

2. On sledges along icy roads.

3. Four weeks.

(中國日報網英語點津 Helen 編輯)

Ancient Chinese built Forbidden City with stones dragged on ice

About the broadcaster:

Ancient Chinese built Forbidden City with stones dragged on ice

Anne Ruisi is an editor at China Daily online with more than 30 years of experience as a newspaper editor and reporter. She has worked at newspapers in the U.S., including The Birmingham News in Alabama and City Newspaper of Rochester, N.Y.

 
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