OF THE SUN OBSERVED AT CAROLINE ISLAND, 188:3. 
121 
in the ‘Phil. Trans.,' 1884. The whole apparatus was the same as that 
described in that paper, with the exception that the two prisms were employed 
instead of one. The use to which this instrument was to be put has already 
been referred to. 
H. The prismatic camera also described in the paper j ust referred to. 
K and L. A concave Rowland grating of 5 feet focus arranged for taking ring 
spectra in the 1st and 2nd orders. 
(The same letters are attached to the above as are to be found in Appendix II. in 
the instructions for adjustment drawn up by Mr. Lockyer.) 
The time table of exposures is given in Appendix III., and the times indicated were 
very closely followed. 
The party was attached to the American Expedition under the command of 
Professor Holden, arrangements to this effect having been made by the President of 
the Royal Society. The instructions issued to them will be found in Appendix I. 
The combined parties were taken from Panama in a United States man-of-war, 
and landed on Caroline Island on April 20th, The instruments were ready for use 
on the 3rd May. Owing to bad weather it appears that the trial of the instruments 
was much impeded, but that they were in fair working order by the 6th, the day of 
the eclipse. The instruments were packed up on the 7th May and two following 
days, and the party left the island on the 9th. 
The following are the notes made by Messrs. Woods and Lawrance regarding 
the atmospheric conditions immediately after the eclipse :— 
11.5 —Fleecy clouds over sun. 
11.13—Birds flocking in air; light greyish. 
11.15—Fleecy clouds over sun. 
11 . 20 — „ 
11.30—Totality commenced ; sky very cloudy. 
4 minutes before totality— Bailey’s beads visible. 
2.45—Totality ; Bailey’s beads more plainly seen. 
5 minutes after totality—Sky clouded over. 
They described the corona on the following limb as being very full of detail, with 
many curved rays. Shortly after totality they saw the 1474 line, with a pocket 
spectroscope having a condensing lens and slit. Taking off the slit they saw as rings 
1474, Dg, and C, Dg and C being very faint. In mid totality they only saw the 
1474 line very bright on the west side. 
At end of totality the structure on the preceding limb is described by them as most 
beautiful, exceeding the other side in detail. In the spectroscope they saw the same 
rings, but the 1474 line by far the brightest. The spectrum of the corona during 
totality, when viewmd with a pocket spectroscope, appeared continuous and bright. 
The light was nearly as bright as in Egypt. The corona extended to 2-g diameters, 
MDCCCLXXXIX. —A. 
R 
