The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . Fig. 4. Fig. 5. distances belonging to an equal-intensity (or blackness) curve were combined to amean; the differences, hh9 (mean minus reduced distance) define the equal-intensity(or blackness) curve with reference to the circular mean curve. Finally curves wereinterpolated from the observed 95 curves at regular intervals of the mean distance,An extract of the results is contained in Table I. (p. 337), and graphs of some of thecurves are shown in fig, 5.

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The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . Fig. 4. Fig. 5. distances belonging to an equal-intensity (or blackness) curve were combined to amean; the differences, hh9 (mean minus reduced distance) define the equal-intensity(or blackness) curve with reference to the circular mean curve. Finally curves wereinterpolated from the observed 95 curves at regular intervals of the mean distance,An extract of the results is contained in Table I. (p. 337), and graphs of some of thecurves are shown in fig, 5. (d) Reduction of the Distances of Portions of an Equal-blackness Curve to theMean Distance of that Curve,—Though equal-blackness curves were measured on allpictures at all position angles, only portions of these curves can be used together,because the equal-blackness curves do not everywhere coincide with the equal-intensity curves of the corona. In next section it will be shown (1) that in the caseof Photographs V., VI. and VII., owing to luminosity of the sky, the left and right BLUE-VIOLET LIGHT IN THE SOLAR CORONA ON AUGUST 30,

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