The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . tances for which the average value of Ah (includingAh = 0) is less than a half of the calculated error of the average distance. Thenumber of values is given in Table III. under headings [see preceding section (d)].The average values of Ah increase with the accidental error, but they have alwaysthe same sign, so that the systematic residuals v become very small compared withthe accidental errors v. It would of course have been better if all the images hadb
The Distribution of Blue-Violet Light in the Solar Corona on August 30, 1905, as Derived from Photographs Taken at Kalaa-es-Senam, Tunisia . tances for which the average value of Ah (includingAh = 0) is less than a half of the calculated error of the average distance. Thenumber of values is given in Table III. under headings [see preceding section (d)].The average values of Ah increase with the accidental error, but they have alwaysthe same sign, so that the systematic residuals v become very small compared withthe accidental errors v. It would of course have been better if all the images hadbeen further apart. (See § 1, last section.) The outcome of the discussion given in this section is, that the mean correspondingdistances given in Table III. are also mean correlative distances on the corona. § 6. Photographs Nos. VI. and VII. (a) Duration of Exposure.—Owing to the failure in the driving of the plate-holder only two pictures (VI. and VII.) belong to the three exposures 9*02, 2*82,89*04 seconds. The sum of the durations of exposure of these pictures is thus given 320 PEOFESSOR L. BECKER ON THE DISTRIBUTION OF ^&. (100*88). It is of .some importance to know the upper limit, if not the accuratedurations, of the exposure belonging to Photograph VI. On Photograph No. images are eccentrically superposed (see fig. 6). The order of magnitude of thetime for which they were illuminated can be found from the degree of blackness of the background which belongs to each image. In thisway I find that circle (b) is due to a short exposureof the order of a second, the faint circle (c) (dotted infig. 6) which is faintly visible within the corona is thelunar disc dnring a very long exposure, and semi-circle (a) must belong to an exposure of about10 seconds. Now (6) is exactly at the position onthe plate, as determined by its distance from otherpictures, at which the plate-holder was locked by theelectromagnet of the propelling mechanism. Thecontacts made by the clock
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