TOTAL SOLAE ECLIPSE OP JULY 18, 1860. 
365 
No. or 
letter. 
Eemarks. 
No. or 
letter. 
Eemarks. 
sec. 
sec. 
h 
m 
2 
h 
m 
2 
1. 
23 
38 
1 
Through a cloud. 
22. 
2 
48 
60 
Occultation of spot h. 
2. 
Spoiled. 
f A solarized picture, in conse- 
3. 
Spoiled. 
23 
2 
51 
53 
J quence of the full aperture 
4. 
0 
23 
105 
1 being used and the instanta- 
A. 
0 
29 
45 
neons slide being detached. 
B. 
0 
34 
34 
24. 
2 
55 
88 
Id., the time uncertain. 
C. 
0 
42 
24 
25. 
Totality; time not noted. 
D. 
0 
49 
93 
26. 
Totality; time not noted. 
E. 
1 
3 
23 
f Shaken by wind ; time not 
F. 
1 
13 
85 
27. 
< noted ; the instantaneous slide 
G. 
1 
25 
45 
• 
L had not yet been replaced. 
H. 
1 
29 
76 
28. 
3 
13 
116 
I. 
1 
41 
76 
29. 
3 
17 
32 
Reappearance of spot c. 
i 
1 
45 
3 
! 30. 
3 
20 
24 
6. 
1 
47 
96 
I 31. 
3 
24 
35 
7. 
1 
52 
71 
The first of the eclipse. 
32. 
3 
26 
112 
1 
56 
1 5 
33. 
3 
34 
12 
, 
9- 
2 
2 
79 
Occultation of spot c. 
1 34. 
Spoiled. 
' 10. 
2 
3 
41 
1 35. 
3 
37 
48 
, 11. 
2 
7 
21 
i 36. 
3 
41 
46 
i 12. 
2 
11 
31 
37. 
3 
44 
4 
1 13. 
Clouds. 
; 38. 
Forgot to uncover the plate. 
! 14. 
2 
20 
24 
1 39. 
3 
51 
116 
Spot a uncovered completely. 
1 5. 
2 
22 
97 
i 40. 
Forgot to uncover the plate. 
16. 
2 
27 
103 
3 
59 
5 
Reappearance of spot A 
17. 
2 
33 
36 
42. 
4 
2 
96 
18. 
Spoiled. 
: 43. 
4 
5 
98 
19. 
2 
36 
43 
44. 
4 
10 
75 
20. 
2 
41 
55 
1 45. 
4 
16 
40 
L!!i_ 
2 
46 
46 
i 
The diagram shows the appearance of the cross wires when projected on the glass 
screen. The image of the sun, being twice reversed, is finally depicted on the screen 
in its natural position, north being at the top, south at the bottom, east to the left 
hand, and west to the right hand. In the positive photographs of the eclipse, printed 
from the negatives, the pictures are likewise erect, and the points similarly situated. 
Calling the wires I., II., III., IV., I. w'ould have approximately the position-angle of 45°, 
II. 135°, III. 225°, and IV. 315°. In the measurements, hereafter to be described, the 
several photographs were so placed on the measuring instrument as to cause its circle 
to read respectively one or other of these angles, according as either I., II., III., or IV. 
was employed in adjusting the photograph, the correction to the measured angles, neces- 
sitated by the deviation of that wire from its assumed position in reference to a parallel 
of declination, being subsequently applied. 
The wires were found not to be absolutely at right angles. 
O ^ 
IV. — I. measured , 
. • • 
89 
59-3 
I.— 11 
89 
52 
II.— Ill 

. .. . 
90 
90 
8-7 
360 0 
3 D 
MDCCCLXII. 
