:\\'2 Sir Xiirniiin Lockyer. 



.mil ")5, which occurred respectively at 16 sees, and 5 sees, before 

 totality. The signals " Go " at the commencement of totality, and 

 " Over " at the end, were given by myself, from observations made 

 with the 4-inch Cooke telescope. 



Some of the photographs have not yet l>een developed, and the 

 reports have not yet been received from the ship's parties, so that 

 only a very brief reference to the work accomplished is possible. 



The discussion of the series of photographs taken with the prismatic 

 cameras employed in the last three eclipses indicated that continued 

 work with this form of spectroscope should be undertaken, (1) with 

 the view of obtaining data strictly comparable with the previous 

 photographs, and (2) that an effort should be made to extend the 

 inquiry into comparative lengths of the various arcs. For the first 

 purpose it seemed desirable to repeat the Indian work with the 6-inch 

 camera having two prisms, while for the second an instrument of 

 longer focus was necessary. 



Representations as to the importance of the latter instrument were 

 made to the Royal Society, and ultimately the purchase of a Taylor 

 triple lens of 6 inches aperture and 20 feet focal length was autho- 

 rised. This was received so shortly before the expedition left England, 

 that it was only possible to make a rough trial of the instrument before 

 it was set up at Santa Pola. Both prismatic cameras were worked in 

 conjunction with siderostats, calculations having shown that the 

 position angles of contact were favourably situated after reflection. 



Dr. Lockyer took charge of the two-prism instrument, and Mr. 

 Fowler of that having a long focus, and in each case the programme 

 of exposures was successfully performed. 



The photographs which have been developed indicate the same suc- 

 cession of phenomena recorded in the three previous eclipses, but the 

 recent eclipse was specially advantageous, for the reason that the 

 chromospheric arcs at the instant of contact were of greater length. 



A very complete record of the spectrum of the chromosphere at 

 various depths has been secured with both instruments, and it seems 

 probable that new information as to the distribution of the various 

 vapours will be furnished by the photographs taken with the long- 

 focus instrument. 



The spectrum of the corona shows the green ring at 5303*7, the 

 blue ring at 4231, and the violet ring at 3987'0 : others may possibly 

 appear on closer examination. All the rings are of totally different 

 character from the chromospheric arcs, and have their greatest bright- 



