2¼ ins very slight wear,
Priestley died at Northumberland, Pennsylvania on the 6th of February 1804. One of the great thinkers of the 18th Century, his work in the fields of philosophy and science are particularly noteworthy. He lived here on the Green in Calne for seven years during his time as the Earl of Shelburne's Librarian. Here he "discovered" Oxygen, and developed his erroneous phlogiston theory.
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