Inscription
One of the largest slate-producing centers in the United States. Welsh slate entrepreneur William Roberts first sighted slate in 1844 near a local barn. He and other Welsh immigrants established and worked in numerous slate quarries in this region. Nearby quarries included "Big Franklin"( c.1852), the largest excavation in Slatington; and "Williams," known for its production of school slate.
These sites also contributed to the increase of slate roofing during the late 19th century.
Location
Sources
More markers in Lehigh
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Here was D. George Dery's first Pennsylvania silk mill, built 1897 and later enlarged.
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A blockhouse, erected about 1756, stood 300 feet north of here.
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Founded 1762 by the noted colonial leader and jurist, William Allen.
