Extra MrrreoroLocicaL OpsERVATIONS, 1845. 281 
ACTINOMETER. 
| 
| Makerstoun 
: Makerstoun : | 
1 Mean Time | Sun Observation. | Change | Effect nies Time | In Sun Observation. | (hange| Effect | Mean | Sun’s 
Saimeren nace eer (leet of of ors" liane en of of | Alti- 
- |Begun./Ended. 60s. | Sun. 
First Reading. | Shade. Begun.|Ended,| 60°. | Sun. [oa tude. 
Se. diy. | Sc. div.| Se. diy. | Se. div. d. oh. m. 8. | Se. div.| Se. diy.| Se. div. | Se. div. Se. div. c 
APRIL 22. 
36-3 | 33-0 | —3-3 | 8-9 
28 0/ Sun | 35-3 |40-8 | +5-5 | 8-8 
29 30| Shade| 39-7 | 36-4 | —3-3 | 8-7 
31 0/ Sun / 38-8 | 44-0 | +5-2 | 8-7 
32 30| Shade| 42-5 | 38-8 | —3-7 | 8.9 
34 0| Sun /40-9 |46-1 | +5-2 | 8-8 
| ___—-35 30] Shade] 44-5 | 40-9 | —3-6 | 8-8 
-37:«O| Sun | 22-8 | 28.0 | +5-2 | 8-7 
| 
22 4 21 O| Sun | 21-3 | 24.7 | +3-4 
22 30) Shade | 23-3 | 19-9 | —3-4 | 6-7 
24 O} Sun | 21-3 | 24-6 | +3-3 | 6-8 
25 30} Shade| 23-1 | 19-6 | —3-5 | 6-7 
27 0} Sun | 20-8 | 24-0 | +3-2 | 6-7 |;6-66 | 22-9 
28 30} Shade | 22-7 | 19-3 | —3-4 | 6-6 
30 0} Sun | 20-6 | 23-8 | +3-2 | 6-6 
31 30} Shade | 22-4 | 19-0 | —3-4 | 6-5 
33 0} Sun | 20-0 | 23-1 | +3-1 
22 5 33 O| Sun | 22-4 | 25.3 | +2-9 
34 30} Shade| 25-0 | 23-7 | —1-3 | 3-9 |} 
36 0| Sun | 24-7 | 27-0 | +2-3 | 3-7 
37 30} Shade| 26-4 | 24-9 | —1-5 | 3-8 
39 0} Sun / 25-8 | 28-2 | +2.4 | 4-1 
40 30) Shade | 27-6 | 25-8 | —1-8 | 4-1 |/}3-93 | 12-6 
42 0} Sun /|26-8 | 29-0 | +2.2 | 3-9 
43 30) Shade | 28-3 | 26-6 | —1-7 | 4-0 
45 0} Sun | 27-4 | 29-7 | +2-3 | 4-0 
46 30) Shade | 28-8 | 27-0 | -1-8 | 3-9 
48 0; Sun | 27-6 | 29-5 | +1-9 
22 5 59 O| Sun | 19-6 | 21-1 | 41-5 
22 6 O 30] Shade} 20-2 | 18-1 | —2-1 | 3-5 
2 0} Sun | 18-6 | 19-9 | +1-3 | 3-4 
3 30| Shade} 19-0 | 16-9 | —2-1 | 3-5 
5 0; Sun [17-3 |18-9 | +1-6 | 3-8 
6 
8 
38 30} Shade] 26-8 | 23.4 | —3-4 | 8-4 
40 0} Sun | 25-6 | 30-4 | +4-8 | 8-2 
Y 41 30| Shade} 29-1 | 25-7 | —3-4 | 8-3 
5 43 0| Sun | 27-8 | 32.9 | +5-1 | 8-7 
44 30| Shade] 31-4 | 27-7 | —3-7 | 8-5 
46 0| Sun | 29-7 | 34-3 | +4-6 | 8-7 
47 30} Shade| 32-3 | 27-5 | —4:5 | 8-9 
49 0} Sun | 29-7 |33-9 | +4-2 | 8-6 
50 30} Shade| 32-0 | 27.7 | —4-3 | 8-7 
52 0} Sun | 29-4 | 33-9 | +45 | 8-9 
30} Shade} 31-9 | 27-4 | —4:5 | 8-9. 
0} Sun | 29-2 | 33-6 | +4-4 | 8-7 
30} Shade} 31-9 | 27-9 | —4-0 | 8-4 
53 
55 
56 
58 0| Sun | 29-8 | 34-3 | +4-5 | 8-6 
59 30| Shade] 32-6 | 28-4 | —4.2 | 8-8 
1 0| Sun | 30-2 |34-8 | +4-6 | 8-6 
2 30] Shade] 33-1 | 29-2 | —3-9 | 8-5 
4 0/ Sun | 31-1 |35-6 | +4-5 | 8-6 
5 30| Shade| 33-7 | 29-3 | —4.4 | 8-8 
7 O| Sun /31-0 | 35-3 | +4-3 | 8-6 
8 30] Shade| 33-5 | 29-3 | —4.2 | 8-7 
10 O| Sun | 31-2 | 35-9 | +4-7 | 9.0 
30] Shade| 34-0 | 29-7 | —4-3 | 8-9 
0| Sun | 31-5 |36-0 | +4-5 | 8-7 
30} Shade | 34-2 | 30-0 | —4-2 | 8-8 
0| Sun | 31-9 | 36-6 | +4.7 | 8.8 
30] Shade] 34-8 | 30-9 | —3-9 | 8-5 
0| Sun | 32-8 |37-4 | +4-6 | 8.7 
30| Shade| 35-7 |31-5 | —4-2 | 8-8 
0} Sun | 33-3 |38-0 | +4-7 | 8-7 
30| Shade] 36-3 |32-6 | —3-7 | 8-3 
0| Sun | 34-6 | 39-1 | +4-5 | 8.3 
30| Shade | 37-6 | 33-7 | —3-9 | 8.3 
0} Sun | 35-4 |39-8 | +44 | 8-4 
30| Shade} 38-1 | 34-0 | —4-1 | 8.4 
0| Sun | 35-7 |39-9 | +4-2 | 8-3 
30| Shade] 38-3 |34-2 | —4-1 | 8.4 
0} Sun | 35-9 |40-3 | +44 
30| Shade} 18-2 | 16.0 | —2.2 | 4-1 |+3-48] 9-0 
0} Sun |16-6 | 18-8 | +2-2 | 4.0 
9 30} Shade| 18-4 | 17-0 | —1-4 | 3-2 
11 0} Sun /17-8 | 19-3 | +1-5 | 2-9 
12 30) Shade} 19-1 | 17-7 | —1-4 | 2-9 
14 0} Sun | 18-4 | 20-0 | +1-6 | 3-0 
15 30] Shade | 19-4 | 18-0 | —1.-4 | 3-0 
17 0O| Sun /19-0 | 20-6 | +1-6 | 3-3 
18 30} Shade | 20-1 | 18-2 | —1-9 | 3.3 
20 O| Sun /18-6 | 19-8 | +1-2 | 2-9 |}3-10| 7-2 
21 30) Shade/19-3 | 17-7 | —1-6 | 3-0 
23 0| Sun /|17-9 |19-4 | 41-5 | 3-2 
24 30) Shade| 19-0 | 17-1 | —1-9 | 3-2 
26 0O| Sun | 17-3 | 18-3 | +1-0 | 3-0 
27 30) Shade/ 17-4 | 15-2 | —2.2 | 2.8 
29 0} Sun | 15-1 | 15-3 | 40-2 | 2-5 
30 30] Shade | 14-3 | 11-9 | —2.4 | 2-5 
32 0| Sun | 11-9 | 11-9 0-0 | 1-7 
33 30| Shade | 22.7 | 21-7 | —1-0 | 0-5 |}1-77| 5-4 
35 0} Sun /| 21-4 | 20-4 | —1-0 | 0 
36 30} Shade/19-5 | 17-3 | —2.2 | 1- 
1 
1 
38 0| Sun |17-0 | 16-9 | —0-1 
39 30} Shade} 15-9 | 14-0 | —1.9 
41 0O| Sun /13-8 | 13-5 | —0.3 
il 224 3 20m, The spot of moisture, which has been inside the plate-glass cover since about the commencement of this series (14 55™), 
ihe middle of the plate of glass, oval shaped, about 1} inch long and # inch broad. 
il 224 3h 35m, At the end of this series of observations it was found that there was a small globule of air in the bulb of the actino- 
about one-tenth of an inch in diameter. 
April 224 5 36m, A slight milkiness in the sky to westward ; the sun tolerably favourable. 
April 224 5 59m, The observations after this time were made on the roof of the Observatory, the actinometer being put into the shade 
vering it below the parapet wall. 
ril 224 6h 33m 15s, The screw turned in a little. Trees intervened after 6 42™, preventing further observations. 
