Solar Eclipse of May 28, 1900. 



381 



available for obtaining good images of the flash spectrum. No. 9 

 spectrum, for instance, is one of the finest of the series, and shows 

 about as many bright lines as the mid-eclipse photograph, yet it was 

 exposed 15 seconds before mid-eclipse. Several other photographs 

 taken earlier than No. 9 also show a large number of flash spectrum 

 lines. 



I think this result demonstrates the very great advantage gained at 

 stations near the limit of total eclipse for studying this spectrum. 



In cleaning the lens of the quartz spectrograph shortly before the 

 eclipse, I unfortunately jammed the exposing shutter in such a way 

 that it would not work at the critical time, and no photograph was 

 obtained with this instrument. 



Sixteen photographs were obtained with the 2-inch spectrograph, 

 .and sixteen with the reflecting spectrograph. The following table 

 gives the approximate times of exposure, and the plates used in each 

 instrument : 



The images obtained with the 2-inch spectrograph are not in good 

 ifocus. They are very dense in the region near G, but correctly ex- 

 posed in the ultra-violet. The spectra extend from X 3350 to A 5100. 

 Apparently the maladjustment of focus has produced a linear distor- 

 tion of the images ; and at the edges of several of the spectra, where 

 '.the direction of the distortion coincides with the direction of the bright 



