Terrestrial Magnetism with Observation. 



279 



the distribution of the magnetic fluids in the body of the earth, 

 should stimulate every friend of science to contribute his mite 



* 



towards perfecting the theory. With this view, I have computed 

 from Gauss's theory (see Taylor's Scientific Memoirs, Vol. II, 

 Art. 5) the three elements for each station of the four tables given 

 in this Journal, Vol. xliii, pp. 99-102, and for comparison have 

 added the data from observation as far as they could be obtained. 

 The observed variations are taken from the article above quoted, 

 pp. 109-114 Those marked with an (*) were strictly observed, 

 the others were derived from the observations by a method ex- 

 plained in the same article, which also furnishes the reduction to 

 1837. The observations of dip are to be found in the same ar- 

 ticle. For the eastern states the observations are reduced to 

 1S37 by assuming the annual motion — 0'-5; for the western 

 states no correction is applied. The observed intensities for the 

 eastern states are from the Transactions of the American Philo- 

 sophical Society ; those for the western states are from Executive 



Documents, 1839-40, Vol. VI, No. 239. 



Table I. 



PUCES. 



Montreal, 

 Oswego. 



Utica, 



Syracuse, 



^enectada, 

 Albany, ' 



Cambridge, 

 ^Chester, 

 Worcester, 

 k V»ngfieJd, 

 on gmeadow 



rr ro *-idence, 

 Hartford, 



^ cs t Point, 



* e * Haven, 



R W Y ork, 

 fnneeton, 



Baltimore, 

 Kington, 



L 



la 





VARIATION. 



DIP. 



INTENSITY. 



Gauss. 





+§ 

 i 



2 

 1 

 3 

 3 

 5 

 5 

 4 

 3 

 3 

 4 

 3 

 2 

 3 

 2 

 1 



-0 

 -0 



50 

 30 

 42 

 16 

 19 

 2 

 3 

 2!) 



48 



46 

 24 



33 



24 



5 



3 



26 

 55 



15 



39 



Loom is. 



+io 



4 

 5 

 4 

 6 

 6 

 8 

 8 

 8 



7 



7 

 8 



6 



6 



6 

 5 



30 



31 



36 

 34 



57* 

 55 



8 



13 



11 



13 

 43" 

 40* 

 0* 

 23* 



4 09 



3 52* 

 2 14 

 +141 



DAT. I Gauss. Loomis. 



4 38 7*7 



2 40TC5 



3 1175 



2 54 



3 18 



/ 



76 



24 3 

 53-5|75 

 44 274 



3 55 

 3 5 



75 36 0,74 

 75 34 5 74 



3 25 75 280,74 



21-474 



75 

 75 



3 39p5 

 3 25T5 



3 25175 



3 4M74 



3 10174 



4 16 74 



2 55 74 



3 20 74 

 2 56 73 

 2 57 73 

 2 29 7 2 

 2 20172 



19 474 



15-9 74 



7174 



4-274 



58-0,73 



52-5 73 



31-873 



31073 



1 -6!72 



43-4 72 



221 



44-1 



72 

 71 



22-8 71 



l 



55-5 



63 

 532 

 45-3 

 400 

 329 

 24 

 217 

 17-7 

 7-7 

 4-4 

 560 

 509 



290 

 27-0 

 55-7 

 368 

 146 

 38-4 

 175 



Difl'. IGauss. 



/ 



+28-8U-7131 



47 

 51-0 

 50-7 

 54 s 



1-7123 



1-7076 

 I -70! 15 

 1-7IVJ- 



Obs. 



1-805 



551 1-7015 

 57-4 1-6925 



57-7U692I 

 58-2U-6939 



594 1-6953 



59 81 6050 

 6201-6905 

 61-61-6936 



1 -6947 



1-6916 



1-6004 



1 -8097 



Dill. 



-0-0919 



01082 



1-7858 00937 

 1-8254 0-1301 

 18116 01211 





62-8 



640 



65! 



66 6J1 -6897 



67-rJt-6881 



6571-6860 

 +65-311 -6837| 



1-8334 



1.7800 



1-803 



1-8075 



1-8021 



01387 

 0884 

 01126 

 01178 

 01140 



