THE TOTAL SOLAR ECLIPSE OE APRIL 6, 1875. 
153 
Fig. 15 is the sketch made by him during totality. Fig. 16 a more detailed copy 
directly after totality. 
The similarity between this sketch and Mr. Wright’s of the corona in April, 1874, 
again is very striking. 
One point connected with Mr. Shore’s drawing deserves special notice. A remark- 
able rift in the corona towards the south excited his notice during the eclipse, and he 
tried to give as correct a representation of it as possible. This rift is shown not only 
in all our photographs of the corona itself, but also in the prismatic camera. It is, 
indeed, the rift by means of which the upper part of the corona could be most exactly 
determined to be due to hydrogen. 
This shows that though the substance giving the green line may play an important 
part in the corona, the structure is in great part due to hydrogen. 
This is confirmed by an observation of Captain Herschel’s, who, in 1871, found the 
green line of the corona to cross the field with the slit across the edge of a rift. 
(Memoirs of Royal Ast. Soc., p. 23.) 
A great number of drawings have been made by the Siamese. We especially note 
the drawings made by the following gentlemen : — 
H.R.H. Chau fa Maha Mala (fig. 17, Plate 14). 
H.R.H. Prince Devanndaywongse (fig. 18, Plate 14). 
H.R.H. Prince Chetochereun (fig. 19, Plate 13). 
His Majesty the King has sent a drawing of the prominences as seen by him 
during the eclipse (fig. 20, Plate 14). 
IX. THE 0 AMORT A EXPEDITION. 
It has already been stated that Mr. Meldola and Dr. Vogel separated at Galle 
in order to join the expedition sent out from India in charge of Captain Waterhouse. 
They arrived at Camorta on the 22nd of March, and found that considerable preparations 
had already been made by the Assistant Commissioner, Mr. F. A. De Roepstorff. 
All the instruments were in excellent working order on the day of the eclipse, but 
clouds prevented any observation during totality. 
Dr. Vogel, assisted by Mr. Good, third officer of H.M.S. 4 Enterprise,’ had 
intended to photograph the spectrum of the prominences by means of plates prepared 
by his method, which had the greatest sensibility in the yellow part of the spectrum. 
The prismatic camera was in charge of Mr. R. Wood, chief engineer of H.M.S. 
‘ Enterprise.’ 
The quartz telespectroscope was attended to by Mr. Meldola. 
Arrangements had been made to make polariscopic observations by means of a 
polariscopic camera, placed at the services of the expedition by Mr. Spottiswoode, 
F.R.S. The instrument was attended to by Dr. Rud. The dark chamber was in 
charge of Mr. Reynolds. 
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