252 Abstracts of the Makerstoun Observations, 1843. 
TABLE XXV.— Continued. 
Period. 
18\ 
20\ 
22". - 
23 h . 
2".. 
4". 
6h. 
8V 
10\ 
Range. 
0.000 
0-000 
0-000 
0-000 
0-000 
0-000 
0-000 
o-obo 
0-000 
0-000 
0-000 
052 
035 
040 
1 67 
J. KJ 1 
282 
ZOO 
loo 
9R9 
November 
000 
014 
005 
-011 
009 
120 
175 
150 
133 
097 
175 
December 
000 
016 
004 
-006 
026 
086 
176 
165 
196 
095 
196 
Spring 
024 
079 
039 
000 
078 
219 
378 
339 
196 
378 
Summer 
118 
148 
065 
000 
116 
307 
423 
446 
254 
446 
Autumn 
016 
076 
040 
000 
155 
285 
325 
261 
153 
325 
Winter 
000 
027 
014 
031 
107 
157 
155 
163 
112 
163 
{ Winter Solstice 
000 
040 
018 
029 
097 
156 
165 
177 
123 
177 
Equinoxes 
013 
069 
036 
000 
115 
260 
370 
296 
157 
370 
Summer Solstice 
112 
145 
069 
000 
135 
315 
432 
438 
262 
438 
The Year 
032 
075 
031 
000 
106 
234 
313 
294 
171 
313 
Diurnal Variation of the Total Magnetic Force. 
Spring, in the foregoing table, consists of the months of February, March, and April. 
The diurnal curve is double in each month of the year. In the mean for the year, — 
The principal maximum occurs about 6 h p.m., Makerstoun mean time. 
A minimum occurs about ll h 10 m a.m., 
A secondary maximum occurs about 7 h 10 m a.m., 
A minimum occurs between 9 h p.m. and 5 h a.m., 
These observations do not shew the period of this minimum, nor whether it is secondary or principal. 
The principal maximum occurs as late as 7 h p.m. in winter and in summer, and as early as 4 h and 5 h p.m. 
in some of the months about the equinoxes. The secondary maximum occurs at the same hour, 7 h 10™ a.m., 
throughout the year. In the winter months, the principal minimum occurs between 9 h 10 m p.m., and 5 h 10 m 
a.m. The minimum near noon occurs about 9 h 40 m a.m. in mid-winter, and about ll h 10 m a.m. in mid-summer. 
The following table has been formed in order to obtain, if possible, the period of the earliest minimum. 
TABLE XXVI. — Diurnal Variations of the Total Force of the Earth's Magnetism, deduced from 
Tables XII. and XIX. 
Gott. 
M.T. 
Winter 
Solstice. 
Equinoxes. 
Summer 
Solstice. 
Mean. 
Gbtt. 
M. T. 
Winter 
Solstice. 
Equinoxes. 
Summer 
Solstice. 
Mean. 
H. 
0-000 
0-000 
0-000 
0-000" 
H. 
0-000 
0-000 
0-000 
0-000 
10 
213 
600 
281 
355 
22 
081 
397 
16S 
206 
11 
152 
509 
260 
298 
23 
077 
375 
120 
181 
12 
045 
413 
177 
202 
0 
102 
37S 
104 
1S6 
13 
000 
010 
049 
011 
1 
160 
398 
133 
221 
14 
029 
000 
000 
000 
2 
197 
443 
257 
290 
15 
071 
045 
006 
031 
3 
214 
535 
331 
351 
16 
064 
014 
046 
032 
4 
240 
649 
3S9 
417 
17 
044 
148 
145 
103 
5 
237 
69S 
41S 
442 
18 
062 
278 
169 
161 
6 
216 
744 
460 
464 
19 
096 
382 
209 
220 
7 
195 
726 
503 
465 
20 
090 
444 
188 
231 
8 
ISO 
622 
506 
427 
21 
106 
461 
188 
242 
9 
16S 
533 
475 
3S3 
