So 8 
The Transit of Venus in 187 4. [December, 
1874. December. 
N 
Chronometer Greenwich 
Time. Time, 
d. h. m. s. d. h. m. s. 
29 10 17 45 
22 o o 8 16 48 36 
32 o 17 20 36 
8 23 9 
0 
8 17 57 36 
11 
38 
18 0 14 
12 40 
1 16 
15 
8 
3 44 
16 
0 
4 36 
16 
57 
5 32 6 
22 
0 
10 36 
34 
0 
22 36 
37 
30 
26 6 
40 
0 
28 36 
44 
14 
32 49*6 
Remarks made by Observer at the time. 
Ingress. 
Transit, by estimate, of outer edge of 
Venus’s light ring (that was against 
sky) across the sun’s limb. No liga- 
ment or pear-drop seen, though ex- 
pected and carefully watched for. 
Brilliantly clear sky ; light breeze from 
south. 
Spectroscope set up, adjusted, and used. 
Slit placed across Venus’s centre gave 
a black band all along the length of 
solar spedtrum. Slit placed tangential 
to Venus’s disk gave a faint, narrow, 
glimmer of light, slightly brighter than 
solar speCtrum, instead of black band; 
no displacement of solar lines in 
glimmer. 
Egress. 
Eyepiece as before, 125. Of the two 
coloured glasses used for Ingress, one 
now changed for a red glass ; field 
now red and less lighted than at 
Ingress. Definition sharp and excel- 
lent. No boiling visible around sun’s 
limb ; some boiling round Venus’s 
lower limb, and still less around upper 
limb. Removed the red glass and 
substituted a blue one, when the boil- 
ing round Venus became quite visible. 
Removed the temporary substitute 
and restored red glass, as before, and 
thus watched the further progress of 
the transit. 
About one-fourth of Venus’s diameter 
from contact. No ligament visible. 
About one-sixth of Venus’s diameter 
from contact. No ligament visible. 
About one-eighth of Venus’s diameter 
from contact. No ligament visible. 
Less than one-twelfth of Venus’s dia- 
meter from contact. No ligament 
visible. 
About one-twentieth of Venus’s diameter 
from contact. No ligament visible. 
Second internal contact. 
Light ring now visible around Venus’s 
limb against sky. 
No boiling around Venus’s or sun’s limb. 
Venus’s limb against sky only faintly 
seen. 
Light ring has been invisible for some 
time ; was seen for only a short time 
after second internal contact. 
Second external contact. No ligament 
visible thereafter or at anytime before. 
