TOTAL ECLIPSE OF THE SUN, JANUARY 22, 1898. 
195 
Table of Exposures for G-inch Prismatic Camera — continued. 
Number. 
Kind of plate. 
3. a 
Lumiere. 
h 
?5 . 
r 
V . 
d 
1 
1 
4. a 
Lumit'-re. 
h 
i 
......... 
c 
d 
. 
p 
f 
. 
g 
J' . 
h 
55 . 
k 
55 . 
1 
55 . 
O.M.r. ot expo- ^ 
*■ Exposure, 
sure, A.M. ^ 
{ 
to 
li. 
7 
7 
7 
to 
to 
m. s. 
5.3 58 
54 10 
54 11 
54 13 
20 
54 22 
30 
54 
42 
43 
45 
46 
47 
48 
49 
50 
51 
52 
12 sees. 
Inst. 
7 secs. 
8 secs. 
1 
Inst. 
Remarks. 
Slide changed. 
Slide changed. 
End of totality. 
On developing the plates it was found that everything had gone satisfactorily. 
The large plates containing the ten snapshots give the whole story of tlie chromo¬ 
sphere during 12 seconds, the time taken to make the ten exposures. 
The last set of ten exposures did not come out quite as expected, for the reason 
that the duration of totality was a few seconds shorter than had been provided for 
in the time-table, so that only two of the exposures were made before the end 
of totality. The very last exposure, however, taken ahont 8 seconds after totality, 
shows many bright lines. 
Some of the more important photographs are reproduced, without enlargement, 
in Plates 6 and 7. Plate 6 shows the series of ten exposures taken near the 
beginning of totality ; the diagonal streak of light is due to a leak in the plate- 
holder, wliich did not exist on the day preceding the eclipse, when all the slides 
were tested. Plate 7 Includes photographs 2c, and 2>d ; in each case the brightest 
and mo.st conspicuous features are the images of the chromosphere and prominences, 
while the rings representing the spectrum of the corona are relatively faint. 
The succession of changes in the spectra throughout the eclipse requires hut little 
explanation. In the first few exposures (top of Plate 6) the bands of apparently 
continuous spectrum were produced by the last remaining parts of the visible crescent, 
which was broken up by the irregularities of the moon’s limb ; in these bands the 
Fraunhofer lines are clearly seen in the region more refrangible than K, but in the 
violet and blue the Fraunhofer lines are not seen, probably in consequence of over- 
2 c 2 
