40 MEMORIE DELLA SOCIETÀ* 



coDseqaently the daily rate of the chronometer = -+- 5 8 80 that is to say very 

 nearly the daily rate that the chronometer had at the time of our leaving Cal- 

 cutta, viz. ■+• 5 S 33 with a correction of — 2 m 51 s 14 on the mean time of Cal- 

 cutta at noon of 10 tb march 1875, which correction taken to the meridiau of Ca- 

 morta, gives a correction little difference troni that we had found by observa- 

 tion. 



The morning of the 6 th aprii I compared the other chronometers with the Whif- 

 fin, and so prepared the times of the four contacts for each chronometer which 

 wonld be used by the observers. The times were the following 



Chronometer 



I contact 



II 



HI 



IV 



1221 



5" 40 m 8* 



7 4 42 



7 9 12 



8 29 48 



1937 



2 18 26 



3 43 » 



3 47 30 



5 8 6 



1272 



5 38 23 



7 2 57 



7 7 27 



8 28 3 



2070 



10 50 3 



14 37 



19 7 



1 39 43 



Wiffin 



11 41 46 



1 6 20 



1 10 50 



2 31 26 



HI. 



Before the Eclipse I endeavoured to make spectroscopic observations of the chro- 

 mosphere round the whole limb, but 1 only sncceded in doiug so on the mornings 

 of the 4 th et 6 tb aprii, as will be seen in the piate LXII1 ; the Sun was almost 

 entirely free from protuberances which was in favour of the special object of the 

 expedition to examine the light of the corona. In the morning of the 6 th at the 

 angle 102° I saw bright flames which appeared to indicate an eruption; bnt af- 

 ter having finished the examination of the limb ali had disappeared and with tho 

 narrow slit I saw no reversed lines beyond the ordinary ones of hydrogeu: 1 also 

 obtaiued the same result in other parts of the limb. 



IV. 



The first contact recurred just about noon with the sun at only two degrees 

 from tho zenith and consequently it was not possi ble to observe it with my te- 

 lescope I therefore observed the first contact with a small 2" telescope and the 

 same was done by M. r Loder with another telescope of very nearly the same po- 

 wer. The first contact was noted by me at ll h 42 m 47 s , by the Wiffin chrono- 



