“> %s Terrestrial. Magnetism. 151 
- No.2. Dayton, Ohio, Lat. 39° 44! N., Lon. 84° 07' W. Aug. 21, 1840. 
Needle No. 1. B North. | Needle No.2. A North,  |{ 
Face of in Face of face ol ln| Waceel | cee pp ee 
strument.| needle. Dip indicated. strument.| needle. Dip indicated. 
; E. 72° : E. 71°23’ 
Ww w. 70 12 w. w. 2 Ge bi 
w. E 72 28 w. E 71 25.5 
E w. 70 05 E. w. 71 07 
A North. B North. 
E E. 70 25 E E. 71 29 
Ww Ww. 72 19 w w 71 29 
w E. 70 20°. |_w E 71 25 
E Ww. 72 32.5 |x. Ww 71 26° 
8)570 65.5 8)570 56 
Mean; 71 21.937 - (¥ 7: Mean, 71 22" 
No. 3. Hamilton, Ohio, Lat. 39° 23! N., Lon. 84° 32' W. Aug. 20, 1840. 
eedle No. 1. A North. : Needle No. 2. B North. 
reseorind Fateot., ... -. fac PSF) as ana 
strument.| needle. ____ Dip indicated. _| strument. | needle. Dip indicated. 
E. E. M15’ E. E. 71°087.5 
Ww. w. 71 54.5 w. 59 
Ww. E. 70 06.5 w E. 71 12.5 
EB... Ww. 7i- 53.6 E w. 70 59 
B North . A North. 
E. E. 72 00 E E. 70 56.5 
w. w. 70 00 w. w 70 51 
p Weck (Be 71 50 w E ‘70 59 
| Ww. 69 58 a ae 70 61.5 
| 2 | 8/567 67.5 [8/667 87 
Mean, 70 59.687 | Mean, 70 59.625 | 
No. 4. Lebanon, Ohio, Lat. 39° 26’ N., Lon. 84° 6! W. Aug. 24, 1840. 
N 
eedle No. pre RE) TSE |e A North. 
ace of in) Faceof | ‘ace of in- ‘ace 0 
strument nt Dip indicated. ernment tent Dip indicated, 
E. E. Sf ms Bg E. E. 71°06.5 
Ww. 72 OT w w. 70 38.5 
Ww E 70 05.5 w E. | 71 O15 
E w. 08 E w. 70 52° 
B North. B North — 
E E. 72 02.5 E E 71 25 
Ww. Ww. 70 00 Ww Ww 71 04.5 
Ww. | kg 71 52.5 w. E. 71 10 
E. w. 70 OL E. w. 4 Te 
: 8)568 27.5 8 )568 25.5 
Pee rrr] |e, 7 OE 
* Dip at Dayton, in March, 1838, 71° 22'.75. 
