'There were a thousand or more of these, I estimated, which encircled the lamasery. They were, in effect, giant prayer wheels, crammed with thousands of pieces of paper upon which prayers were written, and were placed there to prevent evil spirits from entering the monastery confines.' (Through forbidden Tibet). The city of Jehol is now known as Chengde and in 1956, Jehol province became part of Hebei province.
Source of Descriptive Information
Forman, H. (1936).Through forbidden Tibet: An adventure into the unknown by Harrison Forman. London: Jarrolds. p. 39.; Chengde. (2013). In Encyclopædia Britannica. Retrieved from http://school.eb.com/eb/article-276930