444 



The Total Solar Eclipse of August 9, 189G. 



These numbers show that the chromospheric spectrum is largely 

 composed of enhanced metallic lines in addition to the lines of 

 hydrogen and the cleveite gases. 



In the Fraunhofer spectrum enhanced lines may be regarded as 

 wanting, for in the case of iron and magnesium, at least, they only 

 appear with the feeble intensities which they have in the arc 

 spectrum, while the characteristic arc lines are strong. Here then we 

 find the cause of the dissimilarity of the chromospheric and Fraun- 

 hofer spectrum which is indicated by the following figures : — 



No. of Fraunhofer lines tabulated by RoAvland in the 



region F to K 5694 



No. of lines photographed in the same region, eclipse 



1893 164 



Percentage of Fraunhofer lines 3 



No. of lines photographed in the same region, eclipse 



1896 464 



Percentage of Fraunhofer lines 8 



Clearly then, the chromosphere as photographed in the eclipses of 

 1893 and 1896, is a region of high temperature in which there is a 

 corresponding simplification of spectrum as compared with the 

 cooler region in which the Fraunhofer absorption is produced. 



" The Total Solar Eclipse of August 9, 1896. Report on the 

 Expedition to Kio Island." By J. Norman Lockyer, C.B., 

 F.R.S. Received May 15 —Read June 17, 1897. 



(Abstract.) 



The observing party consisted of Mr. Fowler, Dr. W. J. Lockyer, 

 and myself, and the selection of Kio Island as an observing station 

 was rendered possible by the grant of the services of H.M.S. " Volage." 

 Although the expedition failed iu its main objects, because of 

 unfavourable weather, it is considered desirable to put on record an 

 account of the arrangements which had been made to secure observa- 

 tions, more especially as a new feature was introduced in the train- 

 ing of a large number of officers and men to take part in the 

 observations. 



Profiting by the experience gained in previous eclipses, prismatic 

 cameras of the highest available powers were taken out, as well as a 

 powerful integrating spectroscope. To supplement the work of these 

 photographic instruments, a number of prisms and small slit 

 spectroscopes were provided for use by such assistants as were 

 available. The voluntary services of 74 officers and men of H.M.S. 



