396 



Results of Makerstoun Observations, 1844. 



Variations of Total Magnetic Force with reference to the Moon's Age. — It is evident, from the first portion 

 of Table LVII., that the total force is a minimum about opposition and a maximum about conjunction ; this 

 will also appear in the following means of groups : — 



14 days to 16 days, Full Moon, 0-000017 



17 20 ... 0-000068 



21 24 ... 0-000135 



25 28 ... 0-000130 



29 days to 1 day, New Moon, 0-000132 



2 5 days, 0-000126 



6 9 ... 0-000133 



10 13 ... 0-000034 



The value of the force does not vary greatly for the 10 days before and the 10 days after conjunction, the 

 mean value being 0-000131 ; the mean for the remaining 10 days, including opposition, being 0-000034. There 

 is a slight appearance of a secondary minimum at conjunction, the maxima occurring before and after that epoch. 

 The incomplete series of observations for 1843 gave nearly the same result, the secondary minimum at con- 

 junction being better marked. 



Variations of the Total Magnetic Force with reference to the Moorfs Declination. 

 of groups of the second portion of Table LVII. : — 



-The following are means 



27 days to 1 day, Moon farthest North, 0-000123 



2 5 days, 0-000070 



6 8 ... 0-000060 



9 12 ... 0000054 



13 days to 15 days, Moon farthest South, 0000103 



16 19 ... 0-000091 



20 22 ... 0-000054 



23 26 ... 0-000058 



The simple means and the means of groups indicate that the total magnetic force is a maximum when the 

 moon has its greatest north and greatest south declination ; it is a minimum between these epochs. This result 

 also was obtained from the incomplete series of observations for 1843. 



TABLE LVIII. — Diurnal Variations of the Total Magnetic Force in 1844, as deduced from 



Tables XXVII. and XLIII. 



Mak. 

 M. T. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Year. 



h. 



0-00 



0-00 



0-00 



0-00 



O'OO 



0-00 



0-00 



0-00 



0-00 



0-00 



o-oo 



0-00 



0-00 



12 



0049 



0077 



0137 



0000 



0015 



0228 



0215 



0031 



0000 



0180 



0000 



0027 



0025 



13 



0074 



0043 



0021 



0093 



0027 



0171 



0178 



0029 



0028 



0145 



0010 



0065 



0019 



14 



0044 



0034 



0000 



0094 



0000 



0166 



0168 



0000 



0011 



0102 



0040 



0000 



0000 



15 



0025 



0026 



0094 



0037 



0021 



0206 



0194 



0082 



0016 



0091 



0078 



0004 



0018 



16 



0000 



0041 



0153 



0049 



0033 



0207 



0226 



0164 



0053 



0000 



0097 



0025 



0032 



17 



0000 



0079 



0115 



0077 



0116 



0228 



0240 



0191 



0106 



0074 



0112 



0035 



0059 



18 



0016 



0077 



0227 



0157 



0162 



0208 



0220 



0183 



0119 



0156 



0147 



0056 



0089 



19 



0033 



0086 



0318 



0197 



0166 



0198 



0171 



0166 



0116 



0250 



0151 



0081 



0106 



20 



0056 



0086 



0336 



0172 



0136 



0149 



0103 



0109 



0121 



0250 



0147 



0076 



0090 



21 



0067 



0063 



0309 



0142 



0104 



0068 



0026 



0066 



0093 



0244 



0108 



0052 



0057 



22 



■ 005.8 



0047 



0279 



0128 



0049 



0015 



0002 



0042 



0051 



0245 



0089 



0028 



0031 



23 



0090 



0062 



0335 



0165 



0076 



0000 



0000 



0072 



0077 



0302 



0131 



0049 



0058 







0122 



0111 



0362 



0313 



0158 



0080 



0076 



0125 



0133 



0439 



0276 



0083 



0135 



1 



0183 



0169 



0503 



0344 



0229 



0152 



0176 



0270 



0271 



0490 



0300 



0114 



0212 



2 



0233 



0226 



0618 



0463 



0323 



0246 



0263 



0392 



0377 



0562 



0353 



0166 



0297 



3 



0221 



0263 



0700 



0574 



0406 



0321 



0391 



0524 



0492 



0671 



0469 



0218 



0383 



4 



0221 



0298 



0734 



0607 



0569 



0422 



0498 



0583 



0615 



0656 



0550 



0225 



0443 



5 



0229 



0278 



0782 



0768 



0663 



0465 



0550 



0683 



0612 



0662 



0602 



0224 



0488 



6 



0213 



0292 



0734 



0784 



0679 



0489 



0551 



0688 



0551 



0561 



0546 



0280 



0476 



7 



0200 



0261 



0687 



0669 



0649 



0479 



0561 



0626 



0469 



0565 



0401 



0231 



0428 



8 



0207 



0254 



0585 



0534 



05S7 



0444 



0476 



0550 



0391 



0459 



0303 



0221 



0363 



9 



0177 



0161 



0338 



0399 



0472 



0379 



0379 



0387 



0307 



0334 



0195 



0150 



0252 



10 



0090 



0117 



0101 



0329 



0337 



0298 



0311 



0275 



0233 



0279 



0092 



0115 



0160 



11 



0076 



0000 



0217 



0193 



0201 



0238 



0239 



0084 



0146 



0238 



0028 



0077 



0090 



