Ixvi 
General Results or the Makeestoun Observations. 
lowing quantities, the means for groups of days from four years' observations, are obtained from the last column 
of the first parts of Tables 28 and 45. (Prefix 0-000.) 
Moon's Age, 14'i— le-i 17^—20'' 21'i— 24<i 2.5<i— 28<i 29<i— l-i 2<i— 6^ — 9^ IQi— ISd 
Variations, - 024 + 007 + 024 + Oil + 001 + 008 + 009 - 034 
Tlie total force, therefore, is least near opposition, and it is greatest near the quadratures. (See No. 96, 1st.) 
140. Variations of the I) aili^ Mean Total Magnetic Force, with Reference to the Bloon's Declination. — 
The following variations are derived from the final columns of Tables 28 and 45. (Prefix 0-000.) 
Day after Moon I 27<i— 1^ 2-3—51 6*— 9-1—121 13i— IS-i 16-i— IQi 20-1— 22<i 234—261 
lartnest JNortn. J 
Variations, + 024 - 004 -016 - 010 + 017 - 004 - 001 -005 
These variations indicate that the total force is a maximum when the moon is farthest north, and also 
when it is farthest south, and that is a minimum between these epochs. This result is quite analogous to 
that for the sun's position in declination (see No. 136). In both cases, the total force is greatest when the bodv 
(sun or moon) has its greatest north and south declinations, and it is least during the intermediate positions, 
or when the body is near the equator. 
141. Monthli/ Variations of the Mange of the Total Force. — Tliis law is the same as that for the vertical 
component (No. 97), but has not been deduced for the total force, for the reason given No. 127. It may be 
stated generally, whether the position of the sun or the moon be under consideration, that the diurnal range of 
all the magnetic elements is greatest when the body is rather north of the equator, and that the range is least when 
the body is farthest south and farthest north. It has been found, generally, that when undisturbed mean 
variations are examined, the diminution of diurnal range, when the sun is most northerly, disappears, and 
it is probable that the same would be true with respect to the moon ; the excess of range, when the bodies 
are near the equator, being due to the greater amounts of disturbance which occur at these times. 
(See No. 23.) 
Table 62. — Diui'nal Vainations of the Total Magnetic Foi'ce for each Month, as deduced from the 
Regular Daily Observations made during the Four Years 1843 to 1846. 
Mak. 
Mean 
Time. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Ifov. 
Dec 
h. 
m. 
o-oo 
0-00 
0-00 
0-00 
0-00 
0-00 
0-00 
0-00 
0-00 
0-00 
0-00 
000 
12 
13 
0078 
0036 
0125 
0000 
0051 
0201 
0162 
0049 
0017 
0078 
0000 
0021 
13 
13 
0083 
0014 
0026 
0072 
0012 
0151 
0113 
0026 
0000 
0053 
0006 
0028 
14 
13 
0000 
0000 
0000 
0021 
0000 
0138 
0082 
0000 
0009 
0024 
0008 
0003 
15 
13 
0075 
0006 
0061 
0122 
0005 
0161 
0083 
0041 
0025 
0033 
0033 
0000 
16 
13 
0094 
0030 
0124 
0113 
0080 
0170 
0096 
0107 
0077 
0000 
0052 
0029 
17 
13 
0116 
0055 
0157 
0189 
0151 
0170 
0090 
0132 
0140 
0033 
0067 
0046 
18 
13 
0136 
0073 
0213 
0249 
0200 
0181 
0121 
0163 
0173 
0089 
0085 
0063 
19 
13 
0146 
0091 
0239 
0266 
0190 
0178 
0117 
0162 
0176 
0154 
0082 
0061 
20 
13 
0139 
0085 
0232 
0233 
0132 
0134 
0081 
0118 
0159 
0150 
0072 
0060 
21 
13 
0132 
0056 
0189 
0186 
0080 
0062 
0026 
00S8 
0125 
0133 
0036 
0036 
22 
13 
0124 
0046 
0141 
0154 
0024 
0014 
0001 
0072 
0136 
0115 
0012 
0014 
23 
13 
0161 
0061 
0146 
0155 
0038 
0000 
0000 
0081 
0170 
0143 
0039 
0035 
0 
13 
0182 
0100 
0177 
0216 
0105 
0068 
0072 
0151 
0271 
0234 
0129 
0064 
1 
13 
0248 
0147 
0286 
0310 
0229 
0150 
0174 
0303 
0412 
0332 
0185 
0112 
2 
13 
0288 
0208 
0410 
0447 
0349 
0251 
0311 
0420 
0541 
0411 
0237 
0167 
3 
13 
0301 
0272 
0495 
0574 
0485 
0347 
0475 
0559 
0656 
0521 
0314 
0234 
4 
13 
0307 
0287 
0549 
0658 
0517 
0453 
0589 
0652 
0715 
0517 
0344 
0245 
13 
0319 
0291 
0612 
0800 
0701 
0513 
0662 
0738 
0712 
0498 
0365 
0255 
6 
13 
0306 
0288 
0574 
082 1 
0699 
0546 
0663 
0738 
0586 
0460 
0443 
0298 
7 
13 
0309 
0264 
0529 
0718 
0676 
0535 
0616 
0659 
0529 
0407 
0328 
0261 
8 
13 
0315 
0248 
0454 
0563 
0547 
0479 
0517 
0532 
0390 
0344 
0245 
0165 
9 
13 
0263 
0177 
0323 
0421 
0385 
0396 
0378 
0334 
0272 
0278 
0145 
10 
13 
0121 
0123 
0154 
0352 
0289 
0305 
0293 
0262 
0184 
0216 
0072 
0105 
1 1 
13 
0078 
0040 
0202 
0247 
0196 
0227 
022S 
0099 
0123 
0131 
0019 
0067 
