Joseph von Fraunhofer's (1787-1826) diagram of the lines of the solar spectrum, and above it a curve showing the intensity of sunlight in different parts of the spectrum. From 'Denkschriften der Munchener Akademie', 1814. Engraving


Joseph von Fraunhofer's (1787-1826) diagram of the lines of the solar spectrum, and above it a curve showing the intensity of sunlight in different parts of the spectrum. From 'Denkschriften der Munchener Akademie', 1814. Engraving


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