OBSERVATIONS ON THE MAGNETIC DIP, 
II. SERIES FOR IOWA, &c., 1839. 
fi | . : : Horizontal;Total Intensity, Total Total Intensity 1 
| te Date. | Place. | Latitude. | Longitude. Dip. Intensity.| Hor. being 1000.) Intensity. by Sabine’s unit. | 
6 Ang18 11840, Cincinnati - 7 + '39°06" 84°22’ = 170°2'7'2.6’1000. 2989.40 |1000. 1.81330 | 
75 Sept. 6, St. Louis, - - + - (88 36 69 31 26 |1042.97) 2981.50 | 997.35) 1.80849 | 
| 8| “ °18,Davéenport, - - - = |41°30 '90 25 71 65 939.90) 8028.03 |1012.91; 1.88671 | 
eBientty 116 » Davenport, - - « = |41 30 90 27 71 5515 | 937.92) 8021.82 {1011.00 
10 “ 23,\Lost Grove,- - - - (41 89 90 09 72 02 26 | 935.96] 3028.46 (1015.39 
PEbe cee S20, Wapsipinnic on, - + (4144 (90 23 72 15.00 | 930.16) 3051.06 (1020.61 | 
| 12) “ 27,Iron Ore Bed, - - - (41 55 190 40 72 5030 | 908.52) 3079.59 |1030.16 | 
|13) « geet s Settlement, - 4202 (9106 (7221 | 918.13} 3028.05 |1012.92 | 
114) Oct. 2, |Makoqueta, -~ = = = (4214 90 57 72 43 37°| 903.41) .8042.57> 1017.77 | 
| 15) i 4 a“ Farmer’s Creek, - - |4213 190 23 72 36 914.36} 8057.64 |1022.82 \ 
'16, “ 8, (White Water, - - - [44218 (9038 (7255 892.70| 3038.85 [1016.53 | 
17 “ .. 'N. B. Makoqueta,- - 4223 ° |9052 (7251 889.71] 3017.25 |1009.31 
1 te TS ‘Dubuque, - - 42 29 90 23 73 05 880.55) 3028.66 |1013.00 
19) 6 > 20, Forks of Little Makoquet, 142 31 90 31 73 08 881.27; 3037.84 |1016.02 
aes iT urkey River, - - 42 42 90 48 73:11 873.19} 3018.18 |1009. 
21 «“ 24,/Prairie du Chien, - - |43 01 90 53 30 173 16 35 | 876.34) 8045.44 |1018.73 
22) «“ 29,,Blue Mound, (W. Ts) 43 O1 89 38 73 41 854.00; 3038.54 1017.43 
| 23| 2 Nov. 2, Madison, (W. T’.,)- - [4305 (8906 (74 03 852.06, 3102.25 |1037.76 
fos «5, (Mineral Point, - - - |42 50 89 54 73 20 37 | 868.60| 3030.40 {1013.70 
25 Sep 94,1840,,Cincinnati, - - - - (39 06 84 22 70 2911 | 998.12) 2984.40 | 998.31 
| Mean, excluding Cincinnati & St. Louis,/42°18/10” 90°37'38'"'72°50' 1017.38 
Ul. SERIES OF 1840, OHIO, KENTUCKY, &e. 
26] Aug. 18,)Cincinnati, - - - - |39°06" 84°22’ 70°27/2611000. 2989.40 |1000. 
127 « 20,,;Hamilton, Ohio, - = (39 23 84 32 70 58 978.33] 2999.90 |1003.50 
i28 «“ 21,)/Dayton, Ohio, - - - (39 44 184 17 71 22 | 954.40} 2987.10 | 999.15 | 
Op 8 89, Piqua, Ohio, - - - |40 06 84 13 71 3550 | 946.10) 2997.30 (1002.60 | 
130 « 24,)Lebanon, Ohio,- - - {39 26 84 06 71 02 45 | 972.04; 2993.63 |1001.07 | 
31 « 25,|Mason, Ohio, - - - (39 22 8413 70 54 12 | 976.96) 2986.16 | 998.90 | 
132 wr 26 ,/Cincinnati, ae te te 180-06 84 22 70 27 54 | 997.03] 2981.74 | 997.43 | 
133] Sept. 1, | Williamstown, Kentucky,|38 36 84 22 70 04 07 |1012.20) 2969.27 | 993.25 | 
34, « 2, |Lexington, Kentucky,- |3806 (84 18 69 54 30 1012.00} 2945.94 | 985.42| 1.78686 | 
i395} * 38, \C lay’s Ferry, Kentucky, |87 54 ie 18 69 49 00 |1020.35| 2957.32 | 989.27 | 
‘36 « 4, |Frankfort, Kentucky, - (38 14 84 40 69 54 53 |1015.06| 2954.76 | 988.74 
37) \March 11,| Louisville, Kentucky, - |38 03 85 30 69 54 26 |1023.38) 2978.90 | 996.48 
33 Sept. 10,)Vernon, Indiana, - - [38757 (87 47 68 5617 |1064.61} 2964.51 | 991.33 
igg| * 11,|New Harmony, - - (|38 11 87 48 [69 03 37 |1058.10} 2961.80 | 990.76 | 
40 “ 16,| Princeton, Indiana,- - |38 23 7 30 69 22 48 1044.68) 2966.40 | 992.29 
jot, . 18s ‘Vincennes, Indiana, - 18843 /|87 25 69 51 10 1026.03 2978.89 | 998.54 
ae RU Ps aoli, Indiana, - - + {38 35 86 25 69 33 47 |1031.84; 2953.68 | 988.04 
re “ 4, ,| Cincinnati, -~ = = = 139 06 84 22 70 29 11 | 996.88) 2984.40 | 998.31 
ky Mean, ine eluding Cincinnati but once, 38°4.5/42"'85°21/37"'70°11' 995.00 
FEY. SERIES , 1841, CINCINNATI. 
(44, May 8, (Cincinnati, - - - = (39° 06’ “B4° BY’ /70°2011") 999.58) 2083.88 )"908.56, 
\45,  “ Se. ee a 89 06 | 84 22 |70 2611 |1000. 2986.38 |1000.* 
\46 Mar ch 30 PI viladelphia, - = = 389 57 175 10 1720010 | 917.84, 2970.80 | 994.78 
147 « 31,|Philadelphia, - - - 89 -67 | 75 10 172.01 20 | 917.11; 2971.88 | 994.97 
48 22, Pittsburgh, > + a = 40 32 80 02 172 43 30 | 891.47) 3002.00 {1005.23 
149 April 26, 'Philade Iphia, - - - |39 57 |'75 10 |71 59 917.43) 2965.21 | 994.32 
50 23, Trenton, New Jersey, |40 13 | 74 40 [7159 | 921.60] 2979.60 | 997.76 
5 «. 19, Newark, New Jersey, 40 43 |74 10 |72 49 878.45) 2974.46 | 995.67 
lgo|-« 19 New Votk,.».< ee ae ee OL 98.41 883.52} 2969.20 | 994,28 
153 rr 90) lHarlaem, we «= 40 49 74 72 39 36 882,84, 2961.90 991.80 
ip4| « 20,[New Asylum, - - - | 40 48 72 21 900.26) 2969.18 | 994.24 
155 « 98, Balti - « - + |39 17 | 76 37 |71 3406 | 936.98} 2963.53 | 993.48 
56] 98, Baltimorey = °° 39 17 | 76 387 |71 39 11h 931,92 2953. 82 991.40 
* That of August 18, 1840, being assumed as unity in this series, 
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