110 Dip and Variation of the Magnetic Needle. 
Central position, latitude 43° 24’ N., longitude 72° 57’ W., 
d= 2°.44896, i. e. +8° 26.9, c=+.01585, y=+.01943. Mean 
of the differences at the twelve northern stations — 1’. 4; twelve 
southern +1’, 4; six stations having greatest computed varies 
+0'.2; five least +0’.6; thirteen ‘intorciiod tate —0’.3. 
Taste Ill.—17 Stations. « 
Longi- Annual, Variation 
Station. Latitude. tude. | Variation. [Date motion. 1840, 
t / i i 
gdensburgh, 44 41 | 75 31] 46 10. [issslt5ia | 48 hh [+ ! 
Rossie, ; | 44 22 175 43 6 43° |1839} 5.4 6 48 ai) 
Cazenovia, 4254 |75 54 4 0 |1837| 4.4 413 
Auburn, 4254 |76 38 3 43/1833} 4.2 412 
Geneva, a2-62°\ 77° 3 3 49 |1833} 4.1 418 
Hamilton, 42 48 175 4 30. |1837| 4.4 4 43 
omer, 42 76.15 5 5 /1840}> 4.1 5°56 
thaca, 42 5 6 36) .2 51/1833} 4.1 3 20 
Oxford, 42°24 | 7% 40 430 {1837) 4.4 4 43 
: 42 75. 4°30 |1838} 4.1 4 38 
: - 4125 174 0] 632 |1835| 40] 652 
New Ha 4118 |7258} 613 |1840| 44 6 13 
ampton, 40 59 |7216| .6 8 |1834| 44 6 34 
ae aoe City, 40 43 |74 1 5 34 (1840) 3.6 5 34 
40 40 | 73 59} 457 |1840} 36] 4 57 
Philedel?hia, 39 57 | 75 1b 352 |1837| 3.2 4 8 
West Chester, 39 57 | 75 39 | 325 18321 39!) 353 
Central song latitude 42° 5’ N, longitude 75° 12’ W., 
2°.0827, i.e. +5° 5’.0, c=+.00930, y=-+.01857. ool of 
the caeeheas at the eight most northern stations —32; nine 
southern +2/.9; four stations having greatest computed variation 
+37; four ‘pnt +0.7; nine intermediate —2/.0. 
Taste IV.—19 Stations. 
‘ Lon aly Variation | Diiter-| 
Latitude. mae L Nesthlion Date. ecto | 1840, ences. 
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