110 



Dip and Variation of the Magnetic Needle. 



Central position, latitude 43° 24' N., longitude 72° 57' W., 

 <^=:2°.44896, i. e. +8° 26'.9, :r=r+.01'585, 2/= + .01943. Mean 

 of the diifferences at the twelve northern stations — K4 ; twelve 

 southern +r.4; six stations having greatest computed variation. 

 +0'.2; five least +0^6; thirteen intermediate — 0'.3. 



Central position, latitude 42° 5' N., longitude 75"^ 12' W., d = 

 2°.0827, i.e. +5° 5'.0, a:=+. 00930, 2/ = + .01857. Mean of 

 the differences at the eight most northern stations — 3'.2; nine 

 southern +2'.9 ; four stations having greatest computed variation 

 +3'.7; four least +0'.7 ; nine intermediate — 2'.0. 



