Nature . photo-graphs, comparing the ring with the spectrum of the chromo-sphere and a solar and iron spectrum taken by the sameprisms, shows beyond all question that the wave-length is verydifferent from that generally accepted. The mean result ofmeasurements of different parts of the ring made by and Shackleton and Dr. Lockyer is 53037, or about IJtenth-metres more refrangible than 1474K (531679). Although the new wave-length is not to be regarded as final,for the reason that the conditions under which the photographswere taken necessitate certain small corrections which have n
Nature . photo-graphs, comparing the ring with the spectrum of the chromo-sphere and a solar and iron spectrum taken by the sameprisms, shows beyond all question that the wave-length is verydifferent from that generally accepted. The mean result ofmeasurements of different parts of the ring made by and Shackleton and Dr. Lockyer is 53037, or about IJtenth-metres more refrangible than 1474K (531679). Although the new wave-length is not to be regarded as final,for the reason that the conditions under which the photographswere taken necessitate certain small corrections which have notyet been fully workevl out, it is not likely that it can be in errorby so much as I tenth-metre. The examination of the photographs, which has been under-taken in the first instance by Mr. Fowler, indicates that otherimportant conclusions are to be drawn from the admirable series-obtained by him, among them the possible existence of one ormore new gases, some of the lines of which, as gathered from (he. t the chief hne m the >peclrum ol the corona (.\) «ilh ihe enhanced hnespectrum of the chromosphere (b) and in the ordinary solar spectrum C. Frosts translation, p. 425), with which, according tohis eclipse observations, the green line of the corona iscoincident. According to these results then, two of the chief lines in thespectrum of the corona would be coincident with enhancedlines of iron. The remaining corona lines which have so farbeen measured, are not, however, coincident with enhancedtines. It did not seem possible, therefore, that two of theenhaiiced , of iron should be present without the others,even if it be admitted that the corona may have a temperaturehigh enough to produce any enhanced lines. It appeared then, either that the coincidences of the chromo-spheric and coronal lines about 423 and 531 were accidental,or that they were not real coincidences at all. A carefulexamination of the eclipse photographs of 1896, taken by , and those of
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