The Solar Rotation in June 1911 From Spectrographic Observations Made With the
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Diagram showing method of observations for complete series, omitting cases involving latitudes 30 and 60 in all quadrants. hand, in observation 7 10 two half-exposures are taken at 7 of the double spectrum, respectively before and after the continuous exposure of the single spectrum at 10. Is it possible that this method of obtaining the material has caused the anomaly which we are investigating? To enable us to judge about this it is necessary to know the behaviour of the velocity-differences ...along the plate for each of the observations separate. So far we only dealt with this behaviour as it appeared after grouping them together in the way given in the preceding paragraph. Without giving the complete details it may be stated that if we regard the obser- vations of the Normal Series (mean of the four series), not only is the diminution of the velocity-difference with increasing wave length always apparent, but it 9] Search for Variation of Velocity-Difference with Wave Length 47 also occurs, as far as the accidental errors allow us to judge, in always the same ratio, amounting to about 3 % of the mean value on the plates in question.
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