250 ABSTRACTS OF THE MAKERSTOUN OBSERVATIONS, 1843. 
TABLE XXIV.—Variations of Magnetic Dip, with reference to the Moon’s Age, Declination, and 
Distance from the Earth, as deduced from Tables IX. and XVI. 
Variations| Variations || After |Variations| After | Variations |} Before | Variations} Before | Variations 
Moon’s of | Moon’s of Moon of Moon of and of and of 
Magnetic Age. | Magnetic |/farthest| Magnetic |farthest| Magnetic |} after | Magnetic | after | Magnetic 
Dip. | Dip. North. Dip. 5 Dip. Perigee| Dip. |Apogee| Dip. 
’ i ’ 5 , Days. ce Days. 
0-061 0-178 0-157 
~] 
5 
a 
CONOR WNr Ox 
0-115 7 0-263 
0-131 0-189 0-187 6 0-179 6 0-326 
0-052 0-164 0-251 0-273 0-161 
0-144 0-154 0-200 0.438 0-223 
0-072 0-392 0-134 0-312 0-142 
0-036 0-374 0-080 0-166 0-179 
0-237 0-340 0:046 0-245 0-136 
0-263 0-251 0-184 0-204 0-240 
0-211 0-221 0-127 0-085 0-155 0-000 
0:053 0-309 0-164 | 0-143 0-181 0-115 
0-168 | 0-347 0-260 0-121 0-214 0-136 
0-083 0-307 0-000 0-142 0-154 0-204 
0-000 0-205 0-136 0-200 0-103 0-192 
0-111 0-300 0-147 0-172 0-029 0-089 
0-150 0-167 0-167 0-092 
I 
0-393 
0-187 
0-298 
0:140 
0-210 
0-159 
0-103 
0-083 
NOUBRWNRE DE NWR 
NOUR WNeE Pewee 
VARIATIONS OF MAGNETIC Dip, WITH REFERENCE TO THE Moon’s AGE. 
A glance at the quantities in the first portion of Table XXTV. will at once shew that the dip is a maximum 
when the sun and moon are in opposition, and that it is a minimum when they are in conjunction. This result 
is perhaps more distinct in the following 
Means of Groups. 
14 days to 16 = Full Moon, 0’:249 ‘ days to 1 Hays New Moon, 0114 
iigeaecs: 20 O¢20 25 alae ee 2anrs 5. 0-076 
PAY apenaeaet a emoe 0°112 é beara ands 0°257 
2D cares 28 Ties 0-090 TOMS: UBI oa 0290 
The maximum of dip occurs in these means rather before full moon, and there is an indication of a secondary 
maximum at the time of new moon, the minima occurring immediately before and after ; this indication of a 
secondary maximum is probably too indistinct to be trusted. 
VARIATIONS OF MAGNETIC DIP, WITH REFERENCE TO THE Moon’s DECLINATION. 
Means of Groups. 
27 days to 1 ee Moon farthest North, 0180 13 days to 15 ae Moon farthest South, 0164 
24 EPO 5. 0271 IS Sasacas Ay 0166 
HOgrpocde Bs aie ¢ 0'-239 DON aescea PVN Boe 0°105 
Be Agpnocis 2: 0"140 23) siedes 26... 0°151 
The result from these means does not seem very distinct; on the whole, there seems to be a maximum of 
dip about the time the moon is on the equator moving southwards, and a minimum about the time it is on the 
equator moving northwards. 
