3ftO Mr. .1. Kv-rsln-d. 



Fifteen minutes l>efore miil-rdipse the large spectrograph was slightly 

 readj listed for focus by observing with ;i lens the spectrum image of 

 the diminishing crescent. This was effected without any difficulty or 

 uncertainty. 



I then attempted to focus the 2-inch spectrograph in the same way, 

 using the Fraunhofer lines near G, which were then rapidly becoming 

 sharply defined. As the last determination made photographically 

 appeared to l>e correct, I set it again to the same position. 



Five minutes before mid-eclipse my brother wound up the coelostat 

 clock, and three minutes later I gave the order " Stand by." 



The light waned rapidly, and I began the exposures at 4 h 16 m 58*. 

 At 4' 1 17'" 30" I found it difficult to see the seconds hand of the chrono- 

 meter, and a few seconds later I opened for the 10-second exposure, 

 giving at the same time the signal to expose the quartz spectrograph. 

 The absence of any sound from the shutter warned us that the latter 

 had failed to act. 



At 4 h 18 m I could again see the chronometer face clearly. I con- 

 tinued the exposures according to the programme, finishing the last at 

 4 h 18 18". 



A minute or two later, after removing all the plate holders from 

 their slides, I observed the large prominences on the south-west limb 

 in the spectroscope attached to the 3-inch telescope. They appeared, 

 of course, exceedingly brilliant in the line Ha. Unfortunately, I was 

 unable to make a critical examination of the spectrum, for at this 

 time a crowd of sight-seers inundated the entire camp, and further 

 observation for the time being was impossible. 



Later, 1 observed the time of last contact with the spectroscope. 

 This took place at 



5 h 21 m 34 per clock. 



+ 58 assumed error of clock. 



5 22 32 G.M.T. 



At this moment the moon's limb was seen as a black line projected on 

 the chromosphere. 



(4) JfaHlt*. 



Notwithstanding the fact that my station was outside the zone of 

 total eclipse,* the photographs show that there was quite half a minute 



* From the descriptions given us immediately after the eclipse by M. .Alrudo and 

 others who undertook to determine accurately the duration of totality, it appeared 

 certain that the photosphere never wholly disappeared, a small point of sunlight 

 remaining visible at the moment of mid-eclipse. The edge of the moon's shadow 

 was, moreover, clearly seen traversing the sea and the sand dunes a short distance 

 j.ort)i of our camp, which escaped the shadow by a few hundred metres only. 





