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published work on the distribution of energy in flame spectra is not very extensive, and some of it is difficult to find, occurring merely as a minor part of a problem considered. As might be expected, the methods and apparatus of the different investigators are quite similar. Lens and mirror spectrometers and also gratings have been used for the production of spectra, and linear thermopiles and bolometers for the measurement of the radiant heat. Tyndall 1 explored the spectra of illuminatingdoi:10.1103/physrevseriesi.13.257 fatcat:tycfz7ahgvazbn3mop2e5ytoei