= 
Terrestrial Mo seat 
155 
No. 13. New Harmony, Indiana, Lat, 38° 11! N., Lon, 87° 48! W. Sept. 11, 1840. 
Needle No. 1. B North. k ~ Needle No.2. BNorth. | 
Face of in-| Face of Pace Of in-| Paceol | 2 22 see ee 
strument.| needle. Dip indicated. strument.| needle. | Dip indicated. 
E. E. sed 3 bel E. E. O16’ 
w. Ww. 43 w. w. 69 11.5 
w. E. 70 19.5 w. E. 69 13.5 
E. w. 67 40 E. w. 69 23.5 
A North. A North. 
E. E. 67 58 E. E. 69 02 
Ww. w. 70 18.5 badd Ww. | 68 56.5 
w. E. 67 55 E. 69 00 
E. w. 70 18 EE. w. 68 53 
Sse 29.0 ' 8)552 55 
Mean, 69 03.62 Mean, 69 06.87 
oe sbsetvation, rd 02.3 oa observation, 69 06.8 
3d do. 03. o 3d do. 69 06.8 
a 9.54 a 24.7 ---- 
Mean of 24 obs. 69 03.18- Mean of 24 obs. 69 06.82 
Tn the above observations, it appears that each needle, while it 
gave by repeated observations results consistent with itself, dif- 
fered obstinately from the other to the amount of near four min- 
utes = 
No. 14. Princeton, Indiana, Lat. 38° 23' N., Lon. 87° 30! W. Sept. 16, 1840. 
Needle No.1. A North. Needle No. 2. B North. 
Face of in-) Face of oe go bas” eae Tae ae ae 
Strument. needle. Dip indicated. strument.| needle. Dip indicated. 
E. Bef 68°07’. E. E. 035 
je w. 70 45.5 Ww. w. 69 25.5 
We kB. 04 w. E. | 69 29.5 
> w. 70 39.5 E. w. 69 30.5 
B North orth. 
rE | 70 40 alee ES 69 2 
ne w. 68 00 w. w. 69 05 
Ww. E. 70 35 w. E. 69 27 
Re) ow. 68 07 rE | Ww. 69 03 
"8)554 68.5 “8/555 02.5 
Metin Mean, 69 22.31 Mean, 69 22.81 
