A half-length portrait engraving of Roger Bacon (1214–1292), an English philosopher and scientist. He holds a book in front of him in his left hand.
From a Print by Aegidius Adeler
Listen to the latest episodes of CHF’s award-winning podcast.
Help us preserve and share the history of chemistry and related sciences. Make a tax-deductible donation online.
Nylon valve, 1940s–1950s
©2010 Chemical Heritage Foundation