xlviii 
General Results of the Makerstoun Observations. 
Table 42. — Means of the Positive and Negative Departures of the Daily Means from the Monthly 
Means of the Vertical Component of Magnetic Force, with their Differences. 
Mean D 
eparture 
s, without refer- 
ence to Sign. 
1844. 
1845. 
1846. 
Mean. 
0-00 
0-00 
0-00 
0-00 
0089 
0133 
0122 
0115 
0123 
0112 
0153 
0129 
0135 
0059 
0088 
0094 
0091 
0118 
0099 
0103 
0138 
0136 
0095 
0123 
0117 
0084 
0133 
0111 
0102 
0094 
0153 
0116 
0081 
0117 
0135 
0111 
0085 
0133 
0225 
0148 
0121 
0097 
0165 
0128 
0097 
0140 
0134 
0124 
0087 
0186 
0071 
0115 
Mean Positive Departures. 
^lonth. 
1844. 
1845. 
1846. 
Mean. 
Prefix. 
O'OO 
0-00 
0-00 
0-00 
Jan. 
0068 
0112 
0110 
0097 
Feb. 
0140 
0134 
0167 
0147 
TV/To V 
ividr. 
0109 
0048 
0098 
0085 
April 
0079 
0090 
0098 
0089 
May 
0124 
0110 
0104 
0113 
June 
0091 
0082 
0123 
0099 
July 
0092 
0098 
0191 
0127 
Aug. 
0084 
0090 
0161 
0112 
Sept. 
0066 
0124 
0292 
0161 
Oct. 
0117 
0114 
0158 
0130 
Nov. 
0115 
0109 
0168 
0131 
Dec. 
0113 
0209 
0053 
0125 
Mean Negative Departures. 
1844. 
0-00 
0128 
0119 
0175 
0107 
0155 
0162 
0115 
0078 
0118 
0126 
0084 
0070 
1845. 
0-00 
0164 
0097 
0077 
0171 
0176 
0088 
0091 
0168 
0144 
0084 
0194 
0167 
1846. 
0-00 
0138 
0142 
0079 
0099 
0088 
0144 
0127 
0116 
0183 
0172 
0112 
0105 
Mean. 
0-00 
0143 
0119 
0110 
0126 
0140 
0131 
0111 
0121 
0148 
0127 
0130 
0114 
Diff. of 
Mean 
Depart. 
0-00 
-0046 
+ 0028 
-0025 
-0037 
-0027 
-0032 
+ 0016 
-0009 
+ 0013 
+ 0003 
+ 0001 
+ 0011 
Table 43. — Mean Diurnal Range of the Vertical Component of Magnetic Force, as deduced from 
the Ordinary Daily Observations. 
Year. 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
Mean. 
Prefix. 
1843 
1844 
1845 
1846 
0-00 
0330 
0481 
0812 
0251 
0-00 
0374 
0584 
0630 
0310 
0-00 
0480 
1202 
0849 
0501 
0-00 
0684 
1164 
0859 
0811 
0-00 
0562 
0830 
0662 
0876 
0-00 
0396 
0433 
0461 
0681 
0-00 
0490 
0522 
0537 
1096 
0-00 
0473 
0944 
0797 
1204 
0-00 
0502 
0936 
0924 
1445 
0-00 
0444 
1058 
0601 
1098 
0-00 
0305 
1034 
0497 
0871 
0-00 
0364 
0489 
0504 
0332 
0-00 
0450 
0806 
0678 
0793 
1843) 
1846] 
0290 
0342 
0490 
0747 
0719 
0538 
0793 
0838 
0973 
0771 
0588 
0348 
0621 
1844) 
1845j 
0646 
0607 
1025 
1011 
0746 
0447 
0529 
0870 
0930 
0829 
0765 
0496 
0742 
Mean) 
of all j 
1 
0468 
0474 
0758 
0879 
0732 
0493 
0661 
0854 
0952 
0800 
0677 
0422 
0682 
9 1 . Annual Variatioti of the Diurnal Ranges of the Vertical Com ponent of Jlapuetic Force. — From the num- 
bers in Table 43, it appears, that the diurnal range of the vertical component is greatest at the equinoxes, and 
that it is least at the solstices. The values in Table 43 ai'e deduced from the ordinary daily observations in 
the various years. When we consider the diurnal ranges from all the observations made in each of the vears 
1844 and 1845 (in the manner already noted for the magnetic declination No. 12), we obtain the following 
means for the several months in each year, (prefix 0-00.) 
.1:111. 
March. 
Aj.ril. 
JIay. 
.1 une. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
Mean. 
1844, 
049 G 
0729 
1373 
1327 
0964 
0442 
0545 
1064 
1050 
1171 
1182 
0522 
0905 
1845, 
0943 
0686 
0934 
0924 
0697 
0464 
0546 
0820 
0961 
0634 
0540 
0560 
0726 
Mean, 
0719 
0707 
1153 
1125 
0830 
0453 
0545 
0942 
1005 
0902 
0861 
0541 
0815 
These means give the same law as lias already been deduced from Tabic 43 ; the values are gi-eater than 
those for the same years deduced from the ordinary daily observations, Imt tl\o inoroaso is considerably less 
than in the cases of the magnetic declination and horizontal component. 
