File:Thomas Young Hall's adjustable coal screen 1854.jpeg

Summary

Image of Thomas Young Hall's adjustable coal screen from A Treatise on the Extent and Probable Duration of the Northern Coal Field, by T Y Hall, 1854. The original from which this has been scanned is in the North of England Institute of Mining and Mechanical Engineers. It is reference Tracts vol 39 p219 A. The scan and the upload to Wiki Commons have been made with the permission and direction of their librarian Jennifer Kelly. The original is fragile and this upload does not contain the accompanying textual description which can be consulted via the Institute.

Licensing

	This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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	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.
	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.