ON THE BEARING OF LINES 
49 
TABLE GIVING SECULAR CHANGE OF THE MAGNETIC DECLINA¬ 
TION IN THE UNITED STATES 
(From U. S. Coast and Geodetic Survey Reports) 
Year 
(Jan.1) 
Nebraska 
West 
(Alliance) 
South Da¬ 
kota East 
(Huron) 
South Da¬ 
kota West 
(Rapid City) 
North Da¬ 
kota East 
(Jamestown) 
North Da¬ 
kota West 
(Dickinson) 
Montana 
East 
(Forsyth) 
Montana 
West 
(Helena) 
1750 
1760 
1770 
1780 
1790 
1800 
1810 
1820 
1830 
1840 
O / 
O / 
13 06E 
o / 
o / 
o / 
O t 
18 09E 
O / 
18 53E 
1850 
15 27E 
13 06 
16 20E 
14 31E 
17 37E 
18 27 
19 18 
1860 
15 27 
12 57 
16 20 
14 21 
17 37 
18 36 
19 36 
1870 
15 18 
12 39 
16 10 
14 02 
17 27 
18 36 
19 45 
1880 
14 50 
12 14 
15 50 
13 34 
17 04 
18 21 
19 34 
1890 
14 20 
11 34 
15 17 
12 51 
16 27 
17 53 
19 23 
1900 
14 10 
11 10 
15 07 
12 26 
16 15 
17 50 
19 31 
1910 
14 31 
11 23 
15 27 
12 40 
16 36 
18 17 
20 02 
1920 
14 35E 
11 19E 
15 27E 
12 30E 
16 29E 
18 16E 
20 02E 
