Terrestrial Magnetism. 323 
No.4. Wapsipinnicon River, Sept. 25, 1839. Lat. 41° 45! N., Lon. 90° 23/ W, 
; h. Needle No.2. A North, 
st Pecan noodles Dip indicated. 
E. E 42°23! 
w. W. 71 48 
w. E 72 18 
E. Ww. aa 87 
B North. 
E. “. 72 15 
w. Ww. 72 27 
Ww. E 72 12 
E. w, yi 7a ¥ 
8) P 8)577 57 
Mean, 72 15.25 Mean, 72 14.625 
No.5. Brown’s Settlement, (lowa,) Sept. 20, 1839. Lat. 42° 04! NV., Lon. 91° 02 W. 
Needle No.1. BNorth. | “Needle No.2. A North. 
Manor Kasco | teste Face of 
strument, | needle. ___Dip indicated. eroment. t | needle. | Dip indicated. —__ 
E. E 5 a So E. ; 
w. Ww 71 18 Ww w. 
w. E 73 14 w E. 
E. Ww. 71 26 E : 
A North B North 
E. E 71 26 E. E 
w. Ww.” 73 22 w. w 
w. E 71 19 w. E 
E. Ww. 73 32 E. w 
8)578 58 
Mean, 72 22.25 | _ | Mean, 72 20.625 
No.6. Mahoqueta River, (lowa,) Oct. 1, 1839. Lat. 42° 14) N., Lom. 90° 670°. 
eedle No. 1. forth. pele. Re. 2. 22. See 
‘ace of in-| Face of pierre Face of in-| F 
beer needle. | __ Dip indicated. - 
E. E. 71°a 
w. w. 73 AT 
w. E. 71 40 
E. w. 74 00 
B North 
E. E. 3 35 
w. w. 71 44 
Ww. E. 73 39 
E. w. 71 45 - ; 
| 8)581 52 8)581 46 
Mean, 72 44 Mean, 72 43.25 | 
