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absorbing substance absorption band absorption curve absorption spectra absorption spectrography Absorption Spectrophotometry absorption spectroscopy absorption tubes accurate Adam Hilger Ltd alkaloid Angstrom units aperture Applications of Absorption arsenic atom beam Beer's law Biochem biological Campbell Smith cell centimetres Chem chemist concentration copper density described detected diffusing electrodes elements Emission Spectrography end plates energy Ergosterol error examination exposure extinction coefficient Foodstuffs frequencies galvanometer give graph Hilger quartz Hurter and Driffield I. M. Heilbron infra-red instrument intensity investigations Journal lens light source lines material measurements of absorption ment metal milligram molecular molecules Nicol prism observation obtained optical photographic Photometry Phys prism Proc protein purines quantity quartz spectrograph R. A. Morton radiation Raman effect readings region rotating sector photometer selective absorption shows slit solution spark spectrometer spectrophoto spectroscope spectrum suitable T. A. Webster Technique of Absorption thermopile thickness tion uric acid usually visual Vitamin wave-length