566 
MR. J. NORMAN LOCKYER ON THE 
Table of Exposures. 
No. 
Kind of plate. 
Times 
hy deck watch. 
Exposure. 
Remai’ks. 
1 
Edwards’ Isoch. 
Ill’S. 
2 
mins. 
17 
secs. 
20 
Inst. 
About 6f mins, before totality 
2 
2 
17 
50-52 
2 secs. 
55 ^ H 5 5 5 5 
3 
55 15 
2 
18 
21-29 
8 „ 
5- 
;i u 2 i’ >’ ii 
4 
55 55 
2 
18 
55 
Inst. 
51 ^ 55 55 55 
5 
55 5 5 
2 
20 
55 
15 
3 
51 9j J1 5 5 5 5 
6 
11 15 
2 
23 
19 
15 
1 
55 2 55 55 55 
7 
Mawson 
2 
23 
58 
51 
First photo, dui-ing totality. 
8 
o 
Li 
24 
0 
9 
2 
24 
6-11 
5 secs. 
10 
•> 
24 
21-46 
25 ,, 
n 
2 
24 
48-58 
10 „ 
12 
» 
2 
25 
2 • 
Inst. 
13 
11 
2 
25 
14-19 
5 secs. 
14 
2 
25 
24-49 
25 „ 
15 
15 
o 
Li 
25 
51-61 
10 „ 
About mid-eclipse 
16 
Edwards’ Isoch. 
2 
26 
10 
Inst. 
17 
„ 
2 
26 
12-52 
40 secs. 
18 
2 
26 
55-60 
5 „ 
19 
Mawson 
2 
27 
10-35 
25 „ 
20 
2 
27 
38-48 
10 ., 
21 
11 
2 
27 
50 
Inst. 
Last photo, in totality 
22 
Ilford, Isoch. 
. 2 
28 
3-8 
5 secs. 
3 secs, after totality 
23 
11 11 
2 
28 
10 
Inst. 
10 ,, ,, ,, 
24 
2 
28 
11 
11 „ 
25 
Ilford, Special 
2 
28 
41-49 
8 secs. 
41 „ 
26 
V 11 
2 
29 
41-43 
9 
u 15 
1 min. 41 secs, after totality 
27 
11 11 
2 
30 
42 
Inst. 
2 mins. 42 „ „ ,, 
28 
Edwards’ Isoch. 
2 
31 
42-50 
8 secs. 
3 ,, 42 ,, ,, ,, 
29 
2 
32 
42’44 
9 
4 ,) 42 ,, ,, ,, 
30 
51 11 
2 
33 
42 
Inst. 
^ 5 5 4*2 5 5 5 5 5 5 
The recorded times are not to be taken as the true local times at which the 
exposures were made, as the error of the watch was not precisely known, and the 
object was simply to note the durations of the exposures and the intervals elapsing 
between them. No attempt was made to determine the exact moments of commence¬ 
ment and end of totality, but the photographs taken after totality enable the end to 
be approximately determined from the measured width, of photosphere uneclipsed. 
The end of totality, reckoned by the deck-watch as determined in this way, was as 
follows :— 
From photograph 22 
>5 
55 
55 
5 5 
23 
24 
Mean. 
h. m. s. 
2 28 1 
2 28 2 
2 28 0 
2 28 1 
Taking the duration to he 252 seconds, as calculated, the commencement of totality 
would occur at 2 hours 23 minutes 49 seconds, watch time. Accepting these times, 
