Science, Spectroscopy, Physics, Chemistry, Light.
spie.org/publications/tt48_154_kirchhoffs_law_and_emissivity?SSO=1. “The Era of Classical Spectroscopy.” MIT Spectroscopy Lab — History, web.mit.edu/spectroscopy/history/history-classical.html#:~:text=Foucault%2C%20the%20French%20physicist%2C%20observed,together%20in%201859%20by%20G. (4)Maloney,