Cornwall Iron Furnace
West Cornwall Township, Lebanon County, Pennsylvania
Marker Inscription
Built in 1742 by Peter Grubb near an immensely rich ore deposit and acres of forest for making charcoal fuel. A self-sufficient community included the ironmaster's mansion and workers' houses. The furnace produced pig iron and cast goods, and cannons for the Revolutionary War. Sold in 1798 to entrepreneur Robert Coleman; operated until 1883. It survives fully intact a few miles east at Cornwall.
Erected by Pennsylvania Historical and Museum Commission
The Story
Founded in 1742 by Peter Grubb beside a rich vein of iron ore and vast charcoal-making forests, Cornwall Iron Furnace grew into a self-sufficient industrial village complete with an ironmaster's mansion and workers' homes. Its furnaces poured pig iron, cast goods, and cannon for the Revolutionary War before passing to Robert Coleman in 1798 and running until 1883. Remarkably, the works survive fully intact nearby — a rare window into early American ironmaking.
Why it matters
Cornwall preserves the world of the colonial and early-national iron plantation that armed the Revolution and helped launch American heavy industry, a story usually lost to demolition.
The story behind this marker
AI contextThe era
When Cornwall Iron Furnace was built in 1742, Pennsylvania was still a British colony and America was more than three decades from independence. Iron was one of the young colonies' most strategic materials — needed for tools, hardware, and, when the time came, weapons — and Britain kept a wary eye on colonial ironmaking.
Making iron in this era demanded three things in abundance: ore to smelt, water to power the works, and vast forests to burn into charcoal for fuel. Cornwall had all of them, set beside an extraordinarily rich deposit of iron ore and surrounded by acres of woodland.
The result was a distinctly early-American institution: the iron plantation, a self-contained industrial village built in the wilderness, decades before factories and smokestacks became the American norm.
People & events
Peter Grubb founded the furnace in 1742, siting it to exploit that immensely rich ore and the surrounding forest. What grew up around it was a whole community — the ironmaster's mansion at its center and workers' houses clustered nearby, a settlement organized entirely around the fire and rhythm of the furnace.
Cornwall poured pig iron and cast goods, the workaday products of colonial industry. But when the American Revolution came, the furnace turned to a graver purpose, producing cannons for the war effort — a colonial ironworks helping to arm the fight for independence.
In 1798 the works were sold to Robert Coleman, an entrepreneur who would become one of the era's notable ironmasters. Under such ownership the furnace kept operating for decades, running until 1883 before the age that built it finally passed.
Its place in the American story
Cornwall is a rare surviving window into the world of the early American iron plantation — the self-sufficient industrial community that helped power the colonies and then the new nation. Places like it forged the metal of everyday colonial life and, at a crucial moment, the cannons of the Revolution.
That military role links a quiet Pennsylvania valley directly to the founding struggle of the country. The independence won on distant battlefields depended in part on ironworks like this one, laboring behind the lines.
Most such sites were demolished, dismantled, or simply rotted away as heavy industry moved on. Cornwall's remarkable survival — the marker notes it stands fully intact a few miles east at Cornwall — means the story of how early America made iron, and how it launched into heavy industry, did not have to be lost.
If you visit
This is one of those rare historic sites where you don't have to imagine what's gone, because so much of it is still standing. Give yourself time to take in the scale of an iron plantation — not just the furnace, but the idea of an entire village built to feed and serve it.
Think about the three ingredients the place was chosen for: ore, water, and forest. Once you see how the landscape itself made the industry possible, the whole site reads differently.
Cornwall fits beautifully into a Lebanon County history road trip, and its survival makes it a genuine highlight rather than a roadside footnote. Come curious about how things were actually made in early America — this is one of the best places left to find out.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
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Related people
- · Peter Grubb
- · Robert Coleman
Themes & tags
Nearby & related markers
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