The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . 200. 400. 600. 800. 1000. 1200. 1400. Errors . 1-4 0 15 27 47 70 100 130 These errors are almost twice as great as those in Table III. The excess must,I think, be mainly set down to systematic errors of measurement which are differentfor the several positives. Fig. 7 shows a comparison of the intensity curve with the the observations do not give absolute intensities, but the ratio of theintensities at two correlative distances, I adopt at
The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . 200. 400. 600. 800. 1000. 1200. 1400. Errors . 1-4 0 15 27 47 70 100 130 These errors are almost twice as great as those in Table III. The excess must,I think, be mainly set down to systematic errors of measurement which are differentfor the several positives. Fig. 7 shows a comparison of the intensity curve with the the observations do not give absolute intensities, but the ratio of theintensities at two correlative distances, I adopt at distances hu h®, and heb theintensities as calculated from the formula (D) and calculate the intensities at thecorrelative distances h2, h3, hh h5a, h6a9 h7, from the latter and the known ratios F. BLUE-VIOLET LIGHT IN THE SOLAR CORONA ON AUGUST 30, 1905. 327 The differences between these intensities and the tabular intensities are the out-standing errors. The ratios of the intensities are calculated with ll-40 seconds forthe sixth exposure and the recorded values of the times of exposure for the other 100 500 1000 1500 Scale for h. -1-0)31 328 PEOFESSOE L. BECKER ON THE DISTRIBUTION OP exposures. The outstanding errors thus contain, apart from the errors of /i, all thesystematic errors arising from erroneous records of times of exposure. The pointsbelonging to Photographs I., VI6. which are placed on the curve are shown bydots, while the observed correlative points are marked By circles. The systematicerrors are clearly reflected in these points. § 8. Question whether or not the Formula (D), § 7, holds good at any Position-angle ? Table I. gives at intervals of 15° of position-angle the amount 8h by which thedistance from the suns limb of an equal-intensity curve exceeds the mean distance ofthat curve. Since these quantities were obtained from measurements on PhotographsI., VIII., and IX., which have a uniform background all round, systematic errors ofmeasurement will
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