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In January 1859, He started studying the radiative properties of gases. His experiments included the construction of the first ratio spectrophotometer, which measures the absorptive powers of gases, carbon dioxide, ozone, and hydrocarbons. https://earthobservatory.nasa.gov/features/Tyndall
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Tyndall believed that no one had been able to demonstrate small quantities of heat absorption. On 9th May 1859 he tried several experiments that did not work, but on 18th May he could write ‘the subject is completely in my hands’.
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