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adopted absolute gradients apparent magnitude Ascending Branch Descending Becker and Strohmeier Branch Descending Branch Cassiopeiae Cepheid variables CIRCULAR 434 Color Temperature comparison star data Day Phase Grad derived difference early H plates effective temperature emulsions Epoch arbitrarily set film and total galvanometer deflections gradients and spectral Greenwich GW plates Harv Initial Epoch arbitrarily Julian Abs light curve Log T T H Log T T Plate Log Te Log Log To Spectral lºº LyſRAE mean wave-length microphotometer tracings Pannekoek Payne-Gaposchkin Phase R R photometric reduction curve Plate Day Phase R. C. Williams RADII AND EFFECTIVE reduced relationship relative gradients Rodinal to thirty-two RR Lyrae Schwarzschild set at J.D. Shapley SPECTRAL CLASS spectral type spectrograph spectrophotometric standard plate standard stars SU Cassiopeiae systematic photometric error T T Plate Day Temperature and Spectrum TEMPERATURES RR theoretical thirty-two parts water Variable Stars velocity curve Visual Ascending Branch visual magnitude Wratten