113 Dip and Variatioti of the Magnetic Needle. 



Central position, lat. 39° 53^ N., Ion. 83° 40' W.,d=-- 1.5134, 

 i. e. -3° 30'.8, :r= + .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. 



Table VII. — 16 Stations. 



Central position, lat. 32° 46' N., Ion. 81° 55' W., (5= -2°.78999, 

 i. e. -4° 47'.4, .r = + .006512,y= + .017627. Mean of the dif- 

 ferences at the six most northern stations + OM ; ten most 

 southern — OM; four most eastern +0'.2; three most western 

 + 5'.7; nine intermediate —2^0. 



Table VIII. — 16 Stations. 



