Use of a desk programmable computer for calculating the calibration curve of a photographic emulsion for spectrographic analysis

A computer method for calculating the calibration curve for emulsion-covered glass plates used to interpret densities of lines for quantitative spectrographic work is reported. It follows a slightly modified ASTM graphical method, which is also described, to establish preliminary and emulsion calibration curves. Once the curves are established, the relative intensities are obtained from transmission data pairs for concentration lines and an internal standard line. The program is written in BASIC.