Extra METEOROLOGICAL OBSERVATIONS, 1845. 279 
ACTINOMETER. 
A Makerstoun Ob: “a 
Observation. | Change| Effect} Mean | Sun’s} Mean Time |i Sun servation. | Change| Effect | Mean | Sun’s 
in of of | Alti- of (yo) | y Say ewe ie of of | Alti- 
+ |Begun.|Ended. 60s, | Sun. |Group.| tude. | first Reading. Shade. |Begun.|Ended.| 60%. | Sun Group.| tude. 
Sc. diy.| Se. div.] Se. div. | Se. div.| Se. div 9 ad. ho m 5. Se. diy. | Sc. div.| Se. div. | Se. div. | Se. an c 
Marcu 28. APRIL 21, 22. 
8 18 27 30| Sun /|17-0 |17-9 | +0-9 21 19 35 30| Sun |31-6 |35-1 | +3-5 | 3-8 |) 
! 29 0| Shade} 17-8 | 17-3 | —0-5 | 1:3 37 0} Shade| 16-7 | 16-4 | —0-3 | 3.9 
30 O| Sun | 17-3 |18-1 | +0-8 | 1-3 38 0] Sun | 16-4 | 20-1 | +3-7 | 4-1 
31 30| Shade| 18-0 | 17-6 | —0-4 | 1-2 39 30| Shade] 20-1 | 19-7 | —0-4 | 4-0 3.92| 24.3 
32 30| Sun | 17-6 | 18-4 | +0-8 | 1-2 |/1-24) 6.5 40 30| Sun |19-7 | 23-2 | +3-5 | 3-9 
34 0| Shade| 18-3 | 17-9 | —0-4 | 1-2 42 0| Shade| 23-1 | 22-7 | —0-4 | 3-9 
35 0O| Sun |17-9 |18-7 | +0-8 | 1-2 43 0| Sun | 22-7 | 26-2 | +3-5 | 3-9 
36 30| Shade} 18-5 | 18-0 | —0-5 | 1-3 44 30} Shade} 26-1 | 25-7 | —0-4 | 3-9 
37 30| Sun /|18-0 }18-8 | +0-8 | 1-4 45 30| Sun | 25-7 |29-3 | +3-6 
39 0| Shade] 18-7 | 18-0 | —0-7 | 1-7 
40 0) Sun {18-0 [19-1 | +11) 1-7 |1157| 7.6 ]21 20 23 0] Sun |10-6 |14-0 | +3-4 
41 30] Shade} 19-0 | 18-4 | —0-6 | 1-7 
24 30| Shade| 14-1 | 14-2 | +0-1 | 3-4 
42 30) Sun / 18-4 | 19-4 | 41-0 | 1-5 
25 30| Sun |14-2 |17-8 | +3-6 | 3-5 
44 0| Shade} 19-3 | 18-9 | —0-4 | 1-4 
45 0/8 9 | 19-9 1.0 27 0| Shade} 18-0 |18-1 | +0-1 | 3.6 
q a Regie We dle 3 28 0| Sun |18-1 |22-0 | +3-9 | 3.8 
8 19 54 30| Sun |17-9 | 20-4 | +2-5 29 30| Shade | 22-4 | 22-5 | +0-1 | 3-9 |/3-84| 30-9 
; 56 0} Shade| 20-5 | 20-5 0-0 | 2-5 30 30| Sun | 22-5 | 26-7 | +4-2 | 4-1 
57 0| Sun | 20-5 | 23-1 | +2-6 | 2-7 32 0| Shade} 26-5 | 26-7 | +0-2 | 4.0 
58 30| Shade | 23-2 | 23-1 | —0-1 | 2-7 33 0O| Sun | 26-7 | 30-9 | +4-2 | 4-1 
59 30| Sun / 23-1 | 25-8 | +2-7 | 2-8 34 30| Shade | 31-1 | 31-1 0-0 | 4.2 
1 6| Shade| 26-0 | 25-9 | —O-1 | 2-8 |}2-79| 18-5 35 30| Sun | 31-1 |35-4 | +43 | 43 
2 0| Sun | 25-9 | 28-5 | +2-6 | 2-7 37 0| Shade} 35-7 | 35-7 0-0 | 4-3 
3 30] Shade | 28-6 | 28-4 | —0-2 | 2-9 38 0| Sun | 35-7 |40-1 | +4-4 | 4-4 
4 30] Sun | 28-4 | 31-2 | +28 | 3:0 39 30] Shade | 40-2 |40-1 | —0-1 | 4-6 4-65 | 32.2 
6 0| Shade] 31-2 |31-0 | —0-2 | 3-0 40 30} Sun |40-1 | 44-7 | +4-6 | 4-7 : 
7 O| Sun {31-0 | 33-8 | +2:8 42 0| Shade| 44-9 | 44-8 | —0-1 | 4:8 
43 0| Sun |44-8 |49-5 | +4-7 | 5-0 
APRIL 21, 22. 44 30| Shade| 49-7 | 49-2 | —0-5 | 5-1 | 
23 0| Sun | 20-6 | 22-7 | +2-1 45 30} Sun |49-2 |53-8 | +4-6 
24 30| Shade | 22-5 | 22-0 | —0-5 | 2-6 
27 US a opal tk Ric aa 21 21 23 0| Sun {11-1 |15-8 | +4-7 | 
27 .0| Shade | 24-0 | 23-4 | —0-6 | 2-8 | 
24 30} Shade| 15-6 | 14-8 | —0-8 | 5-3 | 
Bee ant. 252 eae ate a eo 25 30| Sun |148 |19-1 | +4-3 | 5:3 
29 30| Shade| 25-5 | 24-9 | —0-6 | 2-8 |}2-78| 14-5 » | 
27 0| Shade| 18-8 |17-6 | —1-2 | 5-5 | 
30 30| Sun | 24-9 | 27-0 | +2-1 | 2-7 | 
28 0O| Sun {17-6 | 21-9 | +4-3 | 5-5 | 
32 0) Shade| 26-9 | 26-3 | —0-6 | 2-8 P 
29 30} Shade} 21-5 | 20-2 | —1-3 | 5-5 |}5-53 | 38-0 
33 0| Sun | 26-3 | 28-6 | +2-3 | 2-9 
30 30| Sun | 20-2 | 24.3 | +4-1 | 5-5 
34 30] Shade | 28-4 | 27-8 | —0-6 | 2-9 32 01 Sh. 93.9 |99 
35 30| Sun |27-8 [30-1 | +2:3 pete eee setae 
33 0| Sun | 22-4 |26-6 | +4-2 | 5-7 
23 0} Sun | 16-4 |19-7 | +3:3 34 30)| Shade| 26-0 | 24-4 | —1-6 | 58 
24 30} Shade | 20-3 | 20-1 | —0-2 | 3-4 35 30| Sun | 24-4 | 28-6 | +4-2*| 5-8 
25 30) Sun | 20-1 | 23-2 | +3-1 | 3-3 37 0| Shade] 28-0 | 26-5 | —1-5 | 5-7 
27 0| Shade| 23-3 | 23-0 | —0-3 | 3-5 38 0| Sun | 26-5 | 30-7 | +4-2 | 5-7 
28 0} Sun | 23-0 | 26-2 | +3-2 | 3-5 39 30) Shade | 30-2 | 28-7 | —1-5 | 5-6 5.77 39-0 
29 30) Shade | 26-2 | 25-9 | —0-3 | 3-4 |}3-52| 22.9 40 30} Sun | 28-7 |32.8 | +4-1 | 5.8 eee 
30 30| Sun | 25-9 | 29-0 | +3-1 | 3-4 42 0| Shade|32-2 | 30-4 | —1-8 | 5-9 | 
- 32 0} Shade} 29-0 | 28-7 | —0-3 | 3-6 43 0| Sun | 30-4 |34-5 | +4-1 | 5-8 
33 0} Sun | 28-7 |32-1 | +3-4 | 3-7 44 30| Shade | 33-8 | 32-1 | —1-7 | 5-9 
_ 34 30 Shade | 32-0 |31-6 | —0-4 | 3-9 45 30! Sun /32-1 |36-3 | +4-2 
ch 284181 30m, A few thin sheets of cirrus to east, about 10° above the sun. 
214 18h 25m, A slight haze to Hast, like the remains of a fog; a very slight fog in the valleys. 
i1 21419 23m, Thin haze round the horizon. 19 24m, The instrument was exposed to the sun’s rays a few seconds too long; the 
ng was taken at the proper time. 
il 214 20% 38m_46™, 
pril 214 21 23m. Actinometer removed to west end of Observatory : puffs of wind. 
36™ 408, The screw withdrawn. 
A slight breeze. 
