6 



Total Eclipse of the Sen, January 22, 1898. 



*' Total Eclipse of the Sun, January 22nd, 1898. Observations 

 at Viziadrug. — Part IV. The Prismatic Cameras." By Sir 

 Norman Lockyee, K.C.B., F.R.S. Received December 22, 

 1900— Read January 17, 1901. 



(Abstract.) 



The report gives full particulars concerning the 6-inch and 9-inch 

 prismatic cameras which were used during the eclipse, and the results 

 obtained. Twenty-four of the photographs are reproduced. A table 

 is given indicating the wave-lengths and probable origins of the 

 856 lines which have been measured between D and A 3663. 



The investigation shows the probable presence of both arc and 

 enhanced lines of calcium, chromium, iron, manganese, nickel, stron- 

 tium, titanium and possibly cobalt, copper, indium, lead, molybde- 

 num, potassium, and rubidium ; arc lines of aluminium, barium, carbon, 

 magnesium, sodium, scandium and possibly cerium, lanthanum, lithium, 

 rhodium, and tantalum ; enhanced lines of vanadium, and possibly of 

 bismuth, caesium, gold, ruthenium, selenium, silicium, thallium, tin, 

 tungsten, yttrium, zinc, and zirconium. Hydrogen, helium, and 

 asterium are also present. 



No evidence has been found of the presence of antimony, arsenic, 

 cadmium, iridium, mercury, osmium, palladium, platinum, silver or 

 thorium. Further investigations of the coronal rings have led to no 

 definite results regarding their origins. 



" Wave-length Determinations and General Results obtained from 

 a Detailed Examination of Spectra photographed at the Solar 

 Eclipse of January 22, 1898." By J. Eveeshed. Communi- 

 cated by Dr. Eambaut, F.R.S. Received December 12, 1900 

 — Read January 17, 1901. 



(Abstract.) 



In this paper the results are given of a detailed study and 

 measurement of a series of spectra photographed at the eclipse of 

 1898, with a glass prismatic camera of 2 J inches aperture. Ten 

 exposures were made, all yielding good negatives, in which the great 

 extension in the ultra-violet is a marked feature. 



The first two photographs of the series were exposed at 20 

 seconds and 10 seconds before totality respectively, and are images of 

 the cusp spectrum. They show the ' Fraunhofer lines with great 

 distinctness, although the latter are much less dark than in the 



