296 OBSERVATIONS ON THE MAGNETIC DIP, 
31. Frankfort, Kentucky, Latitude 38° 14’, N.; Longitude, 84° 40’, W.; September 4, 1840. 
- | Duration Calculated Total intensity, 
Dip. No. of | Epoch of commencing| of 500 |Tempe-| duration Square of the | Horizontal; Total intensity, |that at Cincin- 
ea Vibrations, Vibrations.) rature. at 60°. Preceding. intensity. | Hor. being 1000. |nati being 1600. 
73°5 |1526.23 2329378.0129|1016.36 
69°54'53" 1 |11h.56m.00s.8 A|1528.8 
73 0 |1508.75|2276326.5625|1014.70 
| 
| 
2 |12 30 58°8P\1511.6 
3 « 05 00 6 |1227.6 
72 5 |1226.71)1504817.0741)1014.12 
| Mean,!1015.06| 2954.76 
Wind from the north; somewhat cloudy. Locality, half a mile east of the capitol, and 
on the south side of a ravine or ancient river bed, close to a precipitous limestone bluff. 
32. Louisville, Kentucky, Latitude 38° 03’, N.; Longitude 85° 30’, W.; March 11, 1840. 
69°54'26"| 1 |11h.40m.02s.4 Al1518. | 39°5|1521.73|2315662.1929]1022.38 
2 12 14 04 OP 1498.4 | 41 |1502,52/2257566.3504) 1023.13 
3 12 48 03 2 1219.2 | 43 |1220.4 |1489376.16 [1024.63 
| | ious /1090°98| 2978.90 | 996.48 
The close coincidence of horizontal intensities, at temperatures so different, is good 
evidence that the coefficients for temperatures have been correctly deduced. Locality, 
Jacobs’ woods, a mile or more south-east of the court house; surface, level substratum 
cliff limestone. At Corn Island, in the falls of the Ohio, not two miles distant, the dip, 
by observations, September 7, 1840, was eight minutes more than at this locality. The 
same thing appeared in 1839. 
33. Vernon, Indiana, Latitude 37° 59', N.; Longitude 87° 47’, W.; September 10, 1840. 
68°56'17"| 1 |11h.30m.028.4 A|1493.2 | '75°5|1490.42/2221351.7764|1065.79 
| 2 {12 14 02 8 P/1477.2 | 76 |1473.77|2171998.0129]1063.44 
Mean,'1064.61 2964.51 991.33 
Clear, wind gentle. Locality, a dense wood on the “bottom land,” or river alluvium, 
five hundred yards east of the town-landing. Substratum, the horizontal sandstone of 
the coal formation. 
34. New Harmony, Indiana, Latitude 38° 11’, N.; Longitude 87° 48’, W.; September 11, 1840. 
69°03'37"| 1 | 3h.00m.02s.0 P|1496.8 | 70° |1495.00/2235025. 1059.27 
| 2 |3 35 01 2 |1480.0 | 69 5/1478.85/2186997.3225|1056.15 
3 | 4 10 03 6 |1201.2 | 70 0/1200.50]1441200.25 |1058.88 
| Mean,|1058,10 | 2961.80 | 990.76 
Cloudy. Locality, on the bank of the Wabash river, at what is called the “cut off,”’ 
three-fourths of a mile south-west of the town. Substratum, sandstone of the coal 
measure. 
35, Princeton, Indiana, Latitude 38° 23’, N.; Longitude 87° 30’, W.; September 16, 1840. 
69°22'48"| 1 | 9h.4577.59s.2 Al 1507.6/75°5 [1504.8 |2264423.04 | 1045.52) 
| 2 [10 20 01 6 | 1491.2/78 0 [1487.3 2212061.29. | 1044.18 
3 |11 11 00 0 | 1209.6'79 25/1208.25]1459868.0625, 1045.34 
Mean,| 1044.68} 2966.40 992,29 
| 
Locality, one-third of a mile north of the court house, in a thick wood of small timber, 
soil, clay and level, evidently wet in the spring season. Geology, horizontal sandstone 
of the coal measures. Wind southwardly, signs of approaching rain. 
