168 Dr Traill on tlie Solar tlclipse of September 7. 18S0. 
Two other thermometers by Ramsden and Lovi, all of which 
agreed on previous trial. 
Just as observations were beginning, the sky, which had been 
hitherto bright, became cloudy, and just as the eclipse began^ 
the sun w^s wholly hidden in clouds, and did not again become 
visible, except for a few minutes after the greatest obscurity. 
Note of Observations made during the Eclipse of Sept. 7. 1820. 
Hour. 
Barom. 
1 Therm. 
attached 
to Bar. 
Therm, 
in Sun. 
Photo- 
meter. 
General Remarks. 
/ it 
Inches. 
' 
11 30 
30.13 
65 
T7i 
78 
Sky tolerably clear. 
12 0 
30.13 
65 
694 
16 
Sky overcast with thick clouds-. 
12 15 
30.13 
63| 
674 
19 
Sky with some openings in it. 
12 24 35 
67 
39 
Do. 
12 35 
30.14 
641 
71 
52 
Sun imperfectly visible, but disk obscure. 
12 43 
30.14 
64| 
70 
16 
A few drops of rain. [place of S. invis. 
1 0 
30.13 
65 
12 
Sky lowering, uniformly obscure ; drizzling rain ; 
1 8 
30.12 
63 
63 
9 
Sky darker ; threatens rain ; remove telescopes. 
1 24 
30.13 
62f 
60 
9 
Driz. rain almost ceased ; gust of wind ; S. invis. 
1 35 
30.13 
61 
60 
5 
Black sky ; wind caused exposed therm, to sink 
1 43 
30.13 
60| 
604 
5 
Darkness about this time greatest. [much. 
1 45 
30.13 
60| 
60 
3 
This seemed the moment of greatest darkness. 
1 55 
30.13 
6ol 
61 
4 
Both thermometers nearly equal ; sky lowering. 
2 5 
30.13 
61 
62 
8 
Body of sun partially eclipsed ; visible about 1' 
2 15 
30.14 
61 
62 
8 
4or 2', pale. 
^ 25 
30.14 
6li 
624 
9 
2 29 
30.14 
6l| 
624 
12 
2 35 
30.13 
6l| 
63 
14 
Clouds a little broken, but sun invisible* 
2 45 
30.13 
62 
64 
20 
2 50 
30.13 
62 
64 
12 
Heavy clouds again closed all round. 
2 55 
30.13 
•62 
64 
10 
3 7 
30.13 
62 
63| 
9 
Calculated end of the eclipse. 
3 15 
30.14 
62 
63| 
12 
Sky as dense as any time of eclipse ; more light. 
3 30 
30.14 
$21 
64 
10 
No raih, but uniformly cloudy. 
3 45 
30.14 
621 
64 
10 
All the instruments removed except Photom. 
4 35 
45 
In a clear gleam of sunshine. 
The rain Was only a few drops : it began about 12^ 45', and 
continued till about 1*^ 24'. The rain was wholly over before 
35'. It is singular that the thermometer attached to the ba- 
rometer, in two instances stood higher than that exposed which 
hung on a wall fronting the south. This must have been owing 
to currents or gusts of wind, to which the latter was much more 
exposed than the former, which was sheltered by the foliage of 
trees. The minimum of temperature during the whole titnc by 
