In 1800 astronomer William Herschel, out of curiosity, used a prism and placed a thermometer on each color of the spectrum to see if there was a difference. He had an extra one lying just next to red and noticed a spike in temperature thus discovering ...
Behind the Lines: Herschel's Discovery of Infra-Red
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Applied Sciences | Free Full-Text | How Infrared Radiation Was Discovered—Range of This Discovery and Detailed, Unknown Information
Behind the Lines: Herschel's Discovery of Infra-Red
William Herschel's 'infrared' prism | Science Museum Group Collection
