ON THE BEARING OF LINES 
4 5 
TABLE GIVING SECULAR CHANGE OF THE MAGNETIC DEC¬ 
LINATION IN THE UNITED STATES 
(From U. S. Coast and Geodetic Survey Reports) 
Year 
(Jan. 1) 
Maine 
N’theast 
Maine 
S’thwest 
New 
Ilamp. 
Ver- 
• mont 
Mass. 
East 
Mass. 
West 
O / 
O / 
O / 
O / 
O / 
O / 
1750 
12 05W 
8 34W 
8 02W 
7 43W 
7 46W 
6 21W 
1760 
11 53 
8 15 
7 28 
7 09 
7 19 
5 52 
1770 
11 53 
8 10 
7 03 
6 44 
7 00 
5 31 
1780 
12 05 
8 10 
6 47 
6 28 
6 50 
5 19 
1700 
12 26 
8 15 
6 42 
6 23 
6 50 
5 17 
1800 
12 58 
8 34 
6 49 
6 30 
7 01 
5 25 
1810 
13 38 
9 02 
7 06 
6 47 
7 20 
5 42 
1820 
14 23 
9 38 
7 32 
7 13 
7 47 
6 08 
1830 
15 12 
10 18 
8 11 
7 48 
8 22 
6 41 
1840 
16 02 
10 57 
8 56 
8 29 
9 04 
7 21 
1850 
16 58 
11 38 
9 46 
9 13 
9 48 
8 05 
1860 
17 43 
12 18 
10 31 
9 59 
10 28 
8 43 
1870 
18 13 
12 48 
11 08 
10 39 
11 01 
9 17 
1880 
18 34 
13 22 
11 38 
11 19 
11 30 
9 58 
1890 
18 44 
13 50 
12 01 
11 42 
11 58 
10 25 
1900 
19 00 
14 19 
12 32 
12 15 
12 33 
10 58 
1910 
19 45 
15 06 
13 20 
13 03 
13 22 
11 45 
1920 
20 31W 
15 55W 
14 10W 
13 53W 
14 12W 
12 34W 
Year 
(Jan.1) 
Rhode 
Island 
Conn. 
N. Y. 
East 
N. Y. 
West 
Penn. 
East 
Penn. 
West 
O 
/ 
O 
/ 
O 
/ 
O 
/ 
O 
/ 
O / 
1750 
7 
04W 
5 
47 W 
7 
35W 
4 
40W 
4 
45W 
1760 
6 
37 
5 
18 
6 
53 
3 
57 
4 
01 
1770 
6 
18 
4 
57 
6 
17 
3 
18 
3 
21 
1780 
6 
08 
4 
45 
5 
50 
2 
46 
2 
48 
1 16W 
1790 
6 
08 
4 
43 
5 
34 
2 
24 
2 
28 
0 52 
1800 
6 
19 
4 
51 
5 
28 
2 
13 
2 
19 
0 37 
1810 
6 
38 
5 
08 
5 
34 
2 
13 
2 
20 
0 31 
1820 
7 
05 
5 
34 
5 
50 
2 
24 
2 
33 
0 37 
1830 
7 
40 
6 
07 
6 
17 
2 
46 
2 
55 
0 52 
1840 
8 
22 
6 
47 
6 
53 
3 
18 
3 
26 
1 16 
1850 
9 
06 
7 
31 
7 
39 
3 
57 
4 
04 
1 48 
1860 
9 
46 
8 
09 
8 
25 
4 
46 
4 
44 
2 26 
1870 
10 
19 
8 
43 
9 
04 
5 
23 
5 
23 
3 06 
1880 
10 
50 
9 
24 
9 
51 
6 
16 
6 
04 
3 46 
1890 
11 
17 
9 
49 
10 
12 
6 
57 
6 
38 
4 25 
1900 
11 
52 
10 
23 
10 
48 
7 
34 
7 
15 
5 02 
1910 
12 
40 
11 
11 
11 
34 
8 
17 
8 
00 
5 40 
1920 
13 
30W 
12 
cow 
12 
22 W 
9 
02W 
8 
43 W 
6 17W 
