439 
Sn-p U-Sn_p Uy the variable part of the morning and eyening 
ranges due to the lunar action ; and in the fourth and sixth, 
the total ranges. The seventh column contains the mean of 
the two latter. The value of Anu- Anu is 9°81, for the 
_ range between 7 A.M. and 1 P.M; and 9’:33 for the range be- 
tween 1 p.m. and 10 P.M. 
se ae 
i a 
Taste IV.—Diurnal Range of the Magnetic Declination dependent on 
Moon’s Age. 
ee eee ee ee 
Morning Range. Evening Range. 
Moon’s | Retar- —_________| Mean 
Age. |dation.| Lunar | Absolute} Lunar | Absolute Range. 
Variation.| Range. | Variation.) Range. 
04 Ob | +067 | 10748 +015 9/48 9/98 
1 1 + 0°68 10°49 + 0°33 9:66 10:08 
2 2 + 0°46 10°27 + 0°38 971 9°99 
3 2 +0°30 10-11 + 0°38 9°71 9:92 
4 3 + 0:04 9°85 +0°31 9°64 9:75 
5 4 — 0:40 9°41 + 0:09 9:42 9°42 
6 5 —0-77 9:04 -0°17 9:16 9:10 
7 6 — 0°93 8°88 — 0°38 8:95 8:92 
8 6 — 0:95 8°86 — 0°38 8:95 8:90 
9 7 — 0°84 8:97 — 0°39 8:94 8:96 
10 8 — 0°63 9:18 - 0°33 9:00 9:09 
11 9 — 0:26 9°55 - 0°16 9:17 9°36 
12 10 + 0°25 10:06 + 0°07 9-40 9-73 
13 10 + 0°40 10°21 + 0:07 9°40 9°80 
14 11 + 0°58 10°39 + 0°36 9:69 10:04 
15 12 + 0°76 10:57 + 0°64 9:97 10°27 
16 13 + 0:90 10°71 +0°81 10:14 10°42 
17 14 +0°75 | 1056 +0°77 | 10-10 10°33 
18 14 +060 | 10°41 +077 | 10°10 10°26 
19 15 +0°35 | 10°16 + 0°50 9°83 10:00 
20 16 — 0°03 9°78 + 0°24 9°57 9°68 
21 17 -0°31 9°50 — 0:08 9°25 9°38 
22 18 — 0°60 9:21 — 0°49 8°84 9:02 
23 18 — 0°65 9°16 — 0°49 8:84 9:00 
24 19 — 0°65 9°16 — 0°75 8:58 8°87 
25 20 - 0°53 9:28 -—078 8°55 8:92 
26 21 -0:19 9°62 — 0°57 8-76 9:19 
27 22 +019 | 10°00 — 0°40 8°93 9°47 
28 22 +041 | 1022 — 0°40 8°93 9°57 
29 23 +051 | 10°32 - O15 9:18 9°75 
