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absorption as estimated absorption band absorption curves absorption doublet absorption lines absorption spectrum acetylene flame amount of spectrum Angstrom units apparatus Becquerel bekT blue Bois and Elias Cadmium calibration curve carbon arc cent chromium coefficient of absorption collimator color constant Cornell University Dewar flask different temperatures edge EFFECT OF TEMPERATURE extraordinary spectra furnace Gibbs gives the value glass specimens heating incident light transmitted intensity of light investigation ioo0 K. S. Gibson known wave-lengths lines and bands liquid air log i/P Lummer-Brodhun spectrophotometer mean wave-length ordinary and extraordinary Phys Physical Review plotted between values point of maximum position potentiometer red glass red specimen relation between wave-length Ri and R2 ruby was placed selenium shift slit sorption band spectrometer straight line Table taken temperatures 1800 thickness throughout the spectrum transmission Uranium values of log Variation various lines washers wave-length and temperature wave-length given wave-length of Ri writer Zinc