46. Variation and Dip of the Magnetic Needle. 
Place. Lat. N. |Lon. W.|Variation. | Date. Authority. 
INDIANA. fe) 41o tio. # 
Logansport, 40 45|86 245 35 x. |1836)/Town plan. 
ILLINOIS. — >" 
41 15/88 32/8 15 ~=—{1821|Public Surveys. 
Al 10 ‘6 8s 0 66 6s 
6c “ 17 O25 1838 “cc 
41 0} “ 6 50 ote = 
40 50) “ (7 43 1833 Z 
40 30} “ |7 30 = |1823 “ 
40 20 6s 7 40 ‘cs se 
40 OF “ {7 55 {1822 p 
39 30} “ 8 O- /|1821 . 
Alton, 38 52/90 12\7 45 1840 omis. 
38 30/88 327 50 {1818)Public Surveys. 
MISSOURI. ; 
37 30 27 30 = |1827 z 
aT O| “Bs se! 
6 128 0 6“ ss 
36 50|/90 27 30 ~ = 
36 40} “ (8 O- {1825 ™ 
MICHIGAN. 
achinac, 45 51/84 31/2 59 = |1827|Lucius Lyon. 
Michigan shore, 44 31/85 32/4 30 =|1838\Geolog. Report. 
se 84 56/2 50 66 “a 
“ 84 2812 45 6c 66 
se 83 50|2 0 73 “ 
ointe aux Barques, 43 51/82 42/1 38 {1835 <, 
I'wenty miles west, < 62 6 = si 
: = 2212 55 1832|Public Surveys. 
Pere Marquette river, is 43/4 34 (|1837/Geolog. Report. 
inaw river, 43 50/22 19 =| 1835 ps. 
Little Pointe aux Sables,/43 31/85 546 O  |1837 oe 
43 20'84 2233 0 |1832|Public Surveys. 
43 19185 596 15 =|1837/Geolog. Report. 
Shore of Lake Huron, |43 5/82 26) 6 1835 $ 
43 0/84 22)3 27 |1831)Public Surveys. 
Grand River, 42 55/86 10)32°to6°|1825|Lucius Lyon. 
= - “* 14°30’ =|1837|Geolog. Report. 
42 50/84 2244 55 |1826|Public Surveys. 
42 30/84 2214 25 = of 
Detroit, 42 24/82 58/3 13 |1822\Lucius Lyon. 
“se sé 3 ‘“ pA 50 1 6 
* - ** (2 10 = |1835\Geolog. Report. 
ms “ “« 2 OO }1840 - 
As some of the stations for Georgia are not to be found on 
Mitchell’s map, their latitudes and longitudes could not be given. 
The name of the county however indicates nearly their posi- 
