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absorption bands absorption spectra accurately Acetanilide aniline arsenate aqueous solution arsanilic acid Atropine Beer's Law Cinchonine citraconic color screen common logarithms component curves computed continuous spectrum curve of log determined equal densities ethyl examined exponential function extinction point method frequency range fresnels geometrical series gradation constant gradation of absorption graph high slope Hydrochloride irradiation length of cell limiting the spectrum locating log log 1/T logc curve Logic graphs logio maxima and minima medium mercury arc obtained ordinate difference p-dichlorobenzene photographed Phys plate plotted point of equal quantity quartz radiant flux range of frequencies ratio reduced regions of high relation relative variations saturated sector photometer series of concentrations shown slit solvent specific transmissive exponent spectral filter spectral region steep strongly absorbing substances Table thickness thiophene tion transmission band transmittancy falls triphenyl phosphate Tsol Tsov ultra-violet unabsorbed spectra vertical shift wave-length