40 A MANUAL FOR NORTHERN WOODSMEN 
TABLE GIVING SECULAR CHANGE OF THE MAGNETIC DEC¬ 
LINATION IN THE UNITED STATES 
(From U. S. Coast and Geodetic Survey Reports) 
Year 
(Jan. 1) 
New 
Jersey 
Ohio 
Indiana 
Illinois 
Iowa 
Mich. 
North 
O / 
O / 
O / 
O / 
O / 
O / 
1750 
4 43W 
1760 
4 04 
1770 
3 31 
1780 
3 06 
1790 
2 50 
1800 
2 45 
3 13E 
4 44E 
5 54E 
1810 
2 50 
3 22 
4 59 
6 18 
1820 
3 06 
3 22 
5 04 
6 33 
10 09E 
6 42E 
1830 
3 31 
3 13 
4 59 
6 37 
10 24 
6 42 
1840 
4 04 
2 53 
4 44 
6 33 
10 30 
6 28 
1850 
4 43 
2 24 
4 21 
6 18 
10 24 
6 02 
1860 
5 22 
1 50 
3 50 
5 54 
10 09 
5 25 
1870 
6 01 
1 14 
3 20 
5 26 
9 44 
4 38 
1880 
6 41 
0 37E 
2 45 
4 48 
9 06 
3 47 
1890 
7 11 
0 02W 
2 05 
4 05 
8 21 
3 00 
1900 
7 46 
0 40 
1 31 
3 34 
7 52 
2 23 
1910 
8 31 
1 08 
1 13 
3 25 
7 57 
2 00 
1920 
9 15W 
1 36W 
0 56E 
3 15E 
7 52E 
1 32E 
Year 
(Jan. 1) 
Michigan 
South 
Wisconsin 
Minnesota 
North 
Minnesota 
South 
1750 
1760 
1770 
1780 
1790 
O / 
O / 
O / 
O / 
1800 
1810 
1820 
4 10E 
8 34 E 
10 27E 
11 20E 
1830 
4 04 
8 40 
10 44 
11 36 
1840 
3 46 
8 34 
10 50 
11 42 
1850 
3 20 
8 16 
10 44 
11 36 
1860 
2 46 
7 49 
10 27 
11 20 
1870 
2 04 
7 14 
9 55 
10 54 
1880 
1 17 
6 28 
9 17 
10 20 
1890 
0 32E 
5 43 
8 33 
9 34 
1900 
0 02W 
5 09 
7 58 
9 03 
1910 
0 27W 
4 57 
8 03 
9 07 
1920 
0 55W 
4 39E 
7 48E 
8 57E 
