My > i e i 
338 C. A. Schott on Magnetic Declination. 
for the years 1840, 1850, and 1860, expressed in minutes. The | 
positive sign expresses west declination increasing (east dimin 
ishing). 
in:: “Leas Annual change. 
Locality. | n| Eo eA. deel "lw. decl’n 21840 1850 | ? 
° ’ 
SE Vt. 9/45] 1813 +74 | 441 | 434 
Portland, Me. 5 14 1765 +8:1 +36 | +84 
Portsmouth, N. 4 10 1777 +77 +35 | +85 
Rutland, 4 18 1800 +6°2 +49 | 455 
Cambridge, 22 12 1782 +6°9 +43 +43 
Newburyport, “iis 4 12 1774 +7-0 +3°77 | +36 
ston, 8 10 1782 +6°7 +4 
Providence, R. 30 5 1779 +61 +53 | +38 
artford, Conn 14 1794 +5°0 +40 | +44 
w Haven, 14 10 1801 +46 +38 | +44 
Albany, N. Y. 10 3 1787 +49 +39 | +40 
woe. x x: 10 11 1799 +30 +4 +46 
New ig | 18 1795 +41 | +37 | +39 
Philadelphia, 11 16 1805 +19 | +47 | +53 
Hatboro, Pa, 18 5 1796 +18 | +42 | +43 
Baltimore, 3 13 1798 | +05 | +89 | +84 
Washington, D.C. | 6 8 1798 +0-4 | +28 | 43:1 
Williamsburg, Va. 3 15 1815 -0°4 +24 | +32 
Table of ene a declinations for 9 stations forming group 1, on or neat’ 
Sivan ast of the “epee States, between the years 1680 and 1860. 
declination is + indicated b plus im — Doompeye' by a minus sign, 
caprewed in degrees and fradtine of a degr 
; 4 | Tt Log 
Sg 5 - 
Pole tee hee | Be age 
* & i. 4 c bm a = 2H 
a =s 30 g 3 Ss a € 3 ES Bd ‘ 
» | aot Bhd Be chess} pee boeod ae 1 
1680 . : - : m % eee a ee leoee ¢. 
#6 SED re ae 
tH secace| OO peoples 
ie ETS Gk 
nk Peg tee A be me 
wad: DUE baal oe te ae 
Te Po a TS Toe 
Perey Se eer 770 6 
Be 701470) 68 6 ; 
or eet 69 70} 68 be 
+63 69 oi 68 S 
Tl T5| 70 oa 
6-3 75 79) 73 yd 
6-7 8:0 8°4 8 
T3 $58} go] s4l 
8-1 928; 96 pis 
89] 100] 103 , 
+99 }+.....|4+108 41086 + HOE 
