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Image ID: 277
Title:Rebuilding the glass melting furnace in the Bryn Athyn glass factory
Source:Raymond and Mildred Pitcairn Archives, Bryn Athyn, PA
Medium:35mm slide
Description: With temperatures inside the glass furnace reaching up to 3000F, even the tough firebrick used to construct it eventually degraded, and the furnace had to be rebuilt once every six months.