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Science, Industry and Business Library: General Collection , The New York Public Library. "Double three-legged gravity escapement" The New York Public Library Digital Collections. 1881. http://digitalcollections.nypl.org/items/42b00fa0-4138-0134-bf6e-00505686a51c
Science, Industry and Business Library: General Collection , The New York Public Library. "Double three-legged gravity escapement" New York Public Library Digital Collections. Accessed February 21, 2019. http://digitalcollections.nypl.org/items/42b00fa0-4138-0134-bf6e-00505686a51c
Science, Industry and Business Library: General Collection , The New York Public Library. (1881). Double three-legged gravity escapement Retrieved from http://digitalcollections.nypl.org/items/42b00fa0-4138-0134-bf6e-00505686a51c
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(still image)
Double three-legged gravity escapement, (1881)
}}
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