Dip and. Variation of the Magnetic Needle. 113 
ree position lat. 32° 48’ N., lon. 849-19’ W., 6 = —1°.0443, 
— 5° 24.7, c=+.000795, y= +.006077. Mean of the dit. 
pestle at the seven most northern stations, +3/.0; nine most 
southern, — 2’.3; four stations having the greatest comptited va- 
tiation, —1’.7; on least, —2’.2; seven intermediate, +2/.6. 
Tasre [X.—9 Stations. 
Annual Vari [ 
Station. Latitude. |Longitude. | Variation. | Date. /uiotion.| 1840; ences. 
Florence, S47 | 8 54° |-6 83 | 1935 |41's |-8 19° [434 
Tuscaloosa, 335 ¥2 87 43 7 28--} 1839 { 7260 
uisiana, 32 50 92 22 840 | 1835 A 832 | +15 
A 32° 25 92°32 8 30 | 1836 1 824 }- 3 
ty Sg 31 50 92 32 8 1834 821 |+2 
4 31 45 92°22 8 30 | 1834 8 21 |+ 1 
“id 31 40 92 32 8 40 | 1835 832 |- 8 
Mobile, 30.42 838. 16 7 142. |-.1835 4 75 |4+5 
embinns, 29 40 94-0 8.41 ! 1840 4 8 4t '+16 
Central position, latitude 32° 6’ N., longitude 91° 9 WW, Os 
— 19.9581, ive. ~7° 574.5, c=. 000911, y= +.005797. Mean 
of the differences at five northern stations — 2’. 8; four southern 
+3.7; two eastern +i 0; three western +1’.7 ; four interme- 
aime AT. 
_. Taste X10 Stations. 
ys Latitude. = & nittttrhde cae: Pi 
i =— | Spome uae : 
a ee: Ens 
38 5t | 9015 |$F 4s 
38 37, | 90:17 |} 8 49 
| 37.30 | 9 2 | 730. 
36.40 | 909 2 | 8 0 
a 36.10 }. 8652 | 6 585. 
- Central positions latitude 39° 12’ N., longitude 89° 22’. W., 
d= — 1°.58465, 1 —7° 35/1, x= —.000899, y= +. ee 
Mean of the sis stittapiges at five northern stations — 0.8; 
+0/.8; three having greatest computed variation: — “96; 
three least +3". 6; ‘four intermediate 44.5. 
ema —A 
a es . 
+s wa 4 
