
Count Rumford: Patriot or Spy?
6/3/2026 | 1m 50sVideo has Closed Captions
Teacher, spy, inventor: Count Rumford’s story began in NH.
Benjamin Thompson rose quickly in New Hampshire society—while secretly spying for the British. His extraordinary journey from suspected traitor to celebrated European inventor is stranger than fiction.
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Granite State History Minute is a local public television program presented by NHPBS

Count Rumford: Patriot or Spy?
6/3/2026 | 1m 50sVideo has Closed Captions
Benjamin Thompson rose quickly in New Hampshire society—while secretly spying for the British. His extraordinary journey from suspected traitor to celebrated European inventor is stranger than fiction.
Problems playing video? | Closed Captioning Feedback
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Learn Moreabout PBS online sponsorshipDid you know that New Hampshire once harbored a notorious British spy named Count Rumford, who is widely viewed as a revolutionary villain?
He was born Benjamin Thompson in Woburn, Massachusetts, and was recruited by Concord's Reverend Timothy Walker to come and teach the local school children math and science.
Within just a few months of his arrival in Concord, he had married his boss's wealthy and much older daughter.
Suddenly, he was greatly elevated in status and landed himself a commission as a major in the New Hampshire militia.
This was all very awkward because secretly he was a spy who had developed a secret ink so he could send reports to the British about American troop movements.
Eventually, he fled into the welcoming arms of the British Army and never returned to New Hampshire, abandoning his wife and baby daughter.
Now, after the war, Thompson was sent to Bavaria by King George III, and long story short, he helped save the country from a famine by introducing the potato and setting up soup kitchens, something for which he still celebrated in Munich today.
He's best known for his invention of the Rumford fireplace.
It was so impressive that Thomas Jefferson made sure Monticello had one in every room After the war, Thompson was made a noble count, and he chose to name himself after Concord, using its original name, Rumford.
Today, tons of things are named after him, including a brand of baking powder and even a crater on the moon.
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