Abstract
Plate calibration with a group of homologous lines gives more accurate results than the use of a step sector. Using two different source units and two spectrographs the effect of these on plate calibration curves for several different types of plate has been explored, the measurements made for this purpose are also statistically evaluated to give estimates of the variability due to the plate emulsion, to the spectral source, and to microphotometry. The importance of reciprocity law failure and the use of algebraic transformations to extend the linear portions of calibration curves are also discussed with adequate data.
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