112 Dip and Variation of the Magnetic Needle. 
Central position, lat. 39° 52’ N., lon. 83° 40’ W., d= — 1.5134, 
i.e. — 3° 30.8, z=-+.00290, y=+.01441. Mean of the differ- 
ences at the eight most northern stations —0/.2; ten most south- 
ern +0/’.2; four stations having the least computed variation 
—0’.5; six greatest —3/.0; eight intermediate +2/.5. 
Tasie VII.—16 Stations. 
Annual Variation | 
lratituae. Longitude. |Variation.' Date. _|motion. __1840.___'Differences. 
O52r | 820397 | 5° OF 837 |+2/.8|—5° 1/ = 1 
33 46 | 82 5 ee 1 28) 5 1 0 
33 32 }-82 28 |.5 0 | 1837 2.7| 452 +6 
38 971682 1 |. 5 4 =|. 1887 2.7| 456 -19 . 
33 4/°82 9/| 5 4 | 1837 2.7| 456 — 3 
32 57 | 8259 | 527 | 1838 2.6) 5 22 +18 
32 56 | 81 47 | 56 4 | 1837 9.71 456 —20 
32 49 | 81 42 | 455 | 1837 2.9) 4 47 —12 
32 48'}.82 13 | 5.1 | 1837 2.7| 453 +10 
32 42} 80 i 2 Shc [88h 353). 2-44 +26 
32 38 | 8231 | 5 4 | 18388 | 26| 459 +24 
32 20}. 81:38 455 1837 | 2.7| 457 a 
65 1838 
32 5| 81 12 |33 st -1899$ 2.7/ 413 | +12 
32 11 Sie b-63 F608 86) 6 8 —16 
31 48 | 81 37:) 56 5& | 1838 | 26! 5 6 -~ 6 
31 26 | 81 37°} 5 5 | 1838 | 26\-5 0 +- 2 
Central peta, lat. 32° 46’ N., lon. 81° 56 W., 5=—2°,78999, 
i. e. —4° 47.4, r=+.006512, igri tg 017627. Mean of the dif- 
ferences at ar six most northern stations + 0/1; ten most 
southern —0/.1; four most eastern +0'.2; three most western 
+5/’.7; nine ihtermédiate — 2’.0. 
oe 
Taste VIII.—16 Stations. 
Scag a ER OSES fies a vena 
satitnde, ongitude.| Variation. ate, motion . 
34°39! | 839307 |=5° 0" | 7837 |-27.8|—4°5a7 
34 24| 83241 5 1 | 1837 | 2.8! 453 
34 6 0 | 433] 1887 | 2.8| 425 
33 59 | 83 32] 431 | 1837 |, 2.6] 4 93 
33 57 | 8411 | 5 0 | 1839 | 24] 458 
33 50 | 8352 | 510) 1838 | 24] 5 5 
33 34 | 83 40 | 429 | 1838 | 2.4| 4 24 
33 20 | 83 33 4 Saf = 2.4| 427 
337 83.24 15 7 a 19355; 24] 5 7 | =22 
32 28 | 85 11 | 530 | 1839 | 2.0] 5 98 8 
32 9| 84 527 | 1939 | 9.0) 595} >= 9 
/31°49 | 8 2} 530 | 1839 | 1.9] 5 98 = 
31 38) 65 19 | 5 31 | 1839 | 1.9) 5.99 —4. 
30 55 | 84 46 | 530 | 1839 | 1.8] 5 98 12; 
30 26 | 84 27 | 612} 1835 | 18/5 3} +9 
30 24! 87:23 | 6 O01 1835 | 1.4] 553 | +14— 
