Dip and Variation of the Magnetic Needle. lil 
Central position, latitude 43° 49 N., longitude 84° 4! W., 
d=2°.3429, i. e. — 2° 20'.6, e=+.00472, y= + .02429. Mean 
of the differences at the ten most northern stations — 4/. 0; ae 
southern +-4’.4; five eastern +2’.1; four western «163; 
intermediate + 0/4. 
“Taste V.—16 Stations. 
| Longi- - I Annual) Variation | Differ- | 
Station. Latitude. | tude. | Variation.|Date 1840, ences. 
Buffalo, & 52 (7% 6 42% lies7] 41 | 4937 | 44 
irview, 42 5. | 8025 1-0 (0-118 44;+0 9 } -l1. 
hardon, 41 36 | 8116 |— 15 1838} 44) -0 6 | +23 
41 33 | 81 35 |—1 30 {1825} 44 024 | +20 
Cleveland, 41 31 °| 8L 45 19 (1840) 44 019 | +34 
kfield, 41 16 | 80 37 1887) 4.2 27 -19 
Braceville, 41 16 | ee | 50 |1838) 4.2 42 | -16 
Hudson, 41 15 L 26 52 (1840) 4. 52 - 7 
Portage, 41 4 | 81 34 115 418388) 4.é 1 6 | -10 
oster, 40 48.:| 8159 | 2 1. |1837| 4. 1 48 - 27 
arrolton, 40 36 | 81 10 30 1838) 4. 21 | +28 
Dover, 0 32 | 81 31 1 50 |1838) 4, 1 41 - 34 
Coshocton, 40 18. | 81 55 1 30 (1838) 4. 121 /+9 
tesville, 39 56 | 8117 |. 1 22 1838] 4. 114 - 3 
arletta, 39 30 -| 81.28 133 /1838) 4.3 | -1 24 6 
harlottesyille, 38 2 | 78 30}; 0 O 18385) 3.7 !4019 6 
Central position, latitude 40° 53’ N., longitude 81° 2’ W., d= 
°.60404, i. e. —36/.2, r= 4.00676, y=+.01648. Mean of the 
differences at the eight most northern stations +3/.1; eight most 
southern —3/.1; three most eastern —1.3; four Western, a 7; 
nine siilapieeilinihs Soe he 
oe Taste VI.—18 Stations. 
my j Longi- (_ ; ariati iffer- 
| Station. : Latitude. | tude. ‘lv Sinton i ate.|motion.| 1840, _| ences. 
A : ‘ ue nie ae! Fe ae . I 
‘Lower Sandusky, ae 510 3 48 3-+4.3 —8 39 +16 
Flat Rock, 41 18 13.|° 314 3} 3.9 sh 
40 57 9} 3 0 383, 39] 252 
40 Z $2 6 go a Se 5 24°) -16° 
40 ¢ or oo 3.8 eS a 
ik poe 2 30 43 221 |+3 
yf 36} 4 51 3.2 445°. ~3F 
{ 83 45 | 4 30 34 413°)—39 
4 45.| 3-14 mo 3.7 |-+428 
i 2 | ..328 8} 34 259 |+24 
): 9| 4 4 ot |. 368.) -. 4 
)} 296 42 4 6 3.3 3 59 ~ 22 
) 23 4) 312 ~ 43 3 OT 2st 
ae 55 | 3:15 3.6 257 |+11 
43 » 38 | 3 10 3.6 a ed 
30: G 27.| 4 46 } 3.1 4 46 ae 
. oo oe. P06") (2 oo 3} 3.7 2 28 -10 
be BS ae » 30 | 4 35 2.5 4 28 peed 
