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The Hagley Digital Archives provides online access to selected items from the Hagley Library's collection of images, documents, and publications related to the history of business, technology, and society.
The Floating Test
Each fifty-pound sample is dipped in a bath of zinc chloride, pure coal floats and all impurities sink into a basket which segregates them. This apparatus detects the slightest impurities.
Philadelphia and Reading Coal and Iron Company
Titles and descriptions used here created by the company in the 1930s.
Coal mines and miningCoal preparation plantsCoal--Cleaning
1 photographic print : b&w ; 8 x 10 in.
Audiovisual Collections and Digital Initiatives Department, Hagley Museum and Library
Philadelphia and Reading Coal and Iron Company photographs (Accession 1980.318)
[Description and dates], Hagley ID, Box/folder number, Philadelphia and Reading Coal and Iron Company photographs (Accession 1980.318), Audiovisual Collections and Digital Initiatives Department, Hagley Museum and Library, Wilmington, DE 19807
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