TOTAL ECLIPSE OF THE SUN, APRIL 16, 1893. 
593 
Comparison with Results Obtained by Slit Spectroscope. 
Coronal rings, other than those due to 1474 K, or hydrogen, have not previously 
been recorded by the prismatic camera, though some of the lines corresjDonding to them 
appear to have been photographed with slit spectroscopes. 
The coronal rings photographed in 1893 are compared in the following table with 
results obtained by the slit spectroscopes in the years 1882, 1883, 1886, # and 1893,t 
those lines only which are possibly common being included. 
Prismatic 
Camera, 1893. 
A R. 
Slit Spectroscopes, 
1893. 
A A 0 . 
Slit Spectroscopes, 
1886. 
A A°. 
Slit Spectroscopes, 
1883. 
X A 0 . 
Slit Spectroscopes, 
1882. 
X A°. 
3987 
3986-4 
3985-0 (1) + 
3986? 
4086 
4084-2 (4) 
4089-3 (4) 
j 4085 
4085 
4217 
. , 
4216-5 (3) 
4231 
# , 
4232-8 (5) 
4240 
. # 
4241 (4) 
• • 
4241 
4280 
4279-7 
4280-6 (4) 
4279 
4486 
• « 
4485-6 (3) 
We see then that all the coronal radiations above referred to probably correspond 
with lines photographed by Dr. Schuster in 1886. The intensities, however, are 
not the same. 
The number of coronal rings recorded with the prismatic camera is very much 
smaller than the number of lines attributed to the corona photographed with the slit 
spectroscopes in this and previous eclipses. This is, no doubt, partly due to the rings 
* ‘ Phil. Trans.,’ 1889, A, p. 335. 
f ‘ Roy. Soc. Proc.,’ vol. 56, p. 20. 
j Intensity on a scale where 6 = brightest line. 
4 G 
MDCCCXCVI.—A. 
