34 Sir J. Norman Lockyer. 



The exact position of the tube to obtain this result was carefully- 

 determined by calculation. To facilitate the erection of the instru- 

 ment at the station two wooden tops to carry the tube were pre- 

 viously made and taken out. 



It is satisfactory to state that the photographs showed that the 

 experiment was very successful, the arcs coming out exactly as fore- 

 casted. 



Although this instrument was capable of only giving about half 

 the dispersion of the 6-inch, the optical parts were better adapted 

 for recording the ultra-violet region of the spectrum. 



The programme adopted was similar to that of the 6-inch, there 

 being two large plates (16 X 6J) for recording a series of ten snap- 

 shots at and near the times of second and third contacts and nine 

 smaller plates for exposure during totality. All the exposures were 

 successfully made, but the lines in the spectrum are not so distinct 

 owing to warping of the wooden tube by the heat and the consequent 

 disturbance of the focus. 



I shall refer to the results obtained by the prismatic cameras later 

 in this preliminary report. 



Integrating Spectroscope. 



This instrument consisted of a large collimator, two prisms of 

 60, and a receiving camera. It was entrusted to the care of 

 Lieut. Gr. C. Quayle, E..N"., with two assistants. The light which 

 fed this instrument was obtained from a ccelostat, and there was still 

 sufficient room for another instrument to be utilised, so the corona- 

 graph was set up in the same hut. Although three exposures were 

 made, no results were secured owing, it is feared, to an alteration of 

 the slit, which was found closed after the eclipse. 



Six-inch Equatorial with Grating Spectroscope. 



This instrument consisted of a 6-inch lens mounted equatorially. 

 The small grating employed contained 17,296 lines to the inch, and 

 in the focus of the eyepiece was placed a small photographic spec- 

 trum of iron for comparison. 



Professor Pedler, who came to take charge of this instrument was 

 assisted by Mr. Steele, B.N., gunner, and three other volunteers. 

 Up to the present time I have not received Professor Pedler's report 

 of his observations, but I may say that among his observations 

 reported at the time, he recorded the presence of arc lines of iron in 

 the lower corona and the absence of the enhanced lines. 



