File:Illustration of revolving stairs (U.S. Patent 25,076 issued to Nathan Ames, 9 August 1859).jpg

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Description	English: Illustration from U.S. Patent #25,076: Revolving Stairs. Issued to Nathan Ames, 9 August 1859.
Date	1859
Source	US Pat 25,076.
Author	Nathan Ames. Available from the United States Patent Office Web site. Also reproduced by Google Patents.

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:27, 15 June 2012		1,680 × 2,368 (645 KB)	Danmichaelo (talk \| contribs)	Higher resolution scan from Google Patents
	02:12, 1 February 2009		351 × 576 (85 KB)	BFDhD (talk \| contribs)	{{Information \|Description={{en\|1=Illustration from U.S. Patent #25,076: Revolving Stairs. Issued to Nathan Ames, 9 August, 1859.}} \|Source=[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1

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