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The adoption of beehive coke ovens in the 1830s spurred the use of Pittsburgh-seam coal in iron furnaces, and these ovens made better-quality coke than mounds. Pittsburgh-seam coal, especially the highest-quality coal found in the Connellsville district, was the best coal in America for making coke.
hemming process A closed hem A seam. Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials.
Standing-seam metal roof with concealed fasteners. Mechanically seamed metal with concealed fasteners contains sealant in seams for use on very low sloped roofs, suitable for roofs of low pitch such as 0.5/12 to 3/12 pitch. Flat-seam metal with or without soldered seams. Steel coated with a coloured alloy of zinc and aluminium. Stone-coated ...
It is sometimes known as the Connellsville Coke Field. This is because the section of the Pittsburgh coal seam here was famous as one of the finest metallurgical coals in the world. It is locally known as the Connellsville coal seam, but is a portion of the Pittsburgh seam. Coal was mined in this field from the early 19th century.
(University of Pittsburgh Press, 2001) online review; Warren, Kenneth. Bethlehem Steel: Builder and Arsenal of America (2010) excerpt and text search; Warren, Kenneth. The American Steel Industry, 1850–1970: A Geographical Interpretation (1973) (ISBN 0198232144) Whaples, Robert. "Andrew Carnegie", EH.Net Encyclopedia of Economic and Business ...
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