28 © A. Schoti—Magnetic Declination in the United States. 
TABLE I—continued. 
Locality. |Latitude |Longitude Expression of Magnetic Declination. 
° 4 ° é ° 
Nantucket, Mass. 41 17-0] 70 06-0|/D=+ 8-944 2°45 sin (1°35m+ 13° “8) 
Providence, R. I. 41 49°5) 71 241;/D=+ 910+ 2°99 sin (1°45m— _ 3°4) 
+ 0°19 sin (7'2m +116) 
Hartford, Conn. 41 46° | 72 40°83, D=+ 8°06+4 2°90 sin (1:°25m— 26:4) 
New Haven, Conn. 41 18°5| 72 55°7)/D=+ 7°83+ 3°16 sin (1-4 m— 21°6 
Albany, N. Y. 42 39°2| 73 45°8|D=+ 8:224+ 3°05 sin(l-44m— 9 ) 
Oxford, N.Y. 42 26°5| 75 40°5|D=+ 6194 3°24 sin (1°35m— 18°9 
Buffalo, N. Y. 42 52°8) 78 53:5|D=+ 3-404 3-41 sin (1°4 m— 23 3) 
rie, Pa 42 07°8| 80 05°4;D=+ 1:27+ 2°00 sin (1'4 m— 105 
Cc land, O. 41 30°3} 81 42°0 D=— 0°34+4 1°89 sin(14 m+ _ 6:0 
Detroit, Mich. 42 20°0| 83 03°0!'D=— 0°96+ 2°22 sin (1°5 m— 157 
New Yor rk City. 40 42°7| 74 00°4/D—+ 643+ Hl m— 65°5 
0-14 = o 
Hatboro, Pa. 40 12° | 75 OT |D=+ 5°23+ 3°28 sin (1° 13°2 
+0°22 sin re 1m +157) 
Philadelphia, Pa. 39 56:9) 75 09° D=+ 5:42+ 3°35 sin (1°55m— 22°9) 
Washington, D. C. 38 53:3) 77 00°6};D=+ 1°79+4 1 sin (1°5 m+  5°9) 
ry, Va. 36 55°5| 76 00°|D=+ 2°95+4 2°95 sin (1°55m— 35°3 
Charleston, 8. C. 32 46°6| 79 55°8|;D—=— 2°75+4 2°38 sin (1°6 m+ 15°2 
annah, Ga. 32 04°9) 8 ‘5|/D=— 2°544 2°32 sin (15 m— 286 
y West, Fla. 24 33°5| 81 48°5|/D—=— 4°75+ 2°54 sin (1°4 m— a 
Havana, Cub 23 08 | 82 22° |D=— 4°82+ 1:44 sin (1°3 m— 38:2 
Kingston, Jamaica. 17. 65° | 76 50° |! 469+ 1°95 sin (1°2 m+ ee 
New Orleans, La. 29 57-2) 90 03°99; D=— 5°68+ 2°52 sin (1-4 m— 63°8 
Vera Cruz, M 19 12 09 =— 317+ 5°89 sin (1-1 m— 60°5 
Mexico, mers 19 25-9] 99 06°0/D=— 4304 4°59 sin (1'1 m-- 765 
‘Acapulco 16 50°5| 99 52°3/D=— 3:97+ 4-96 sin (1°05m— 767 
Panama, Wee lieonde 8 5 J=— 628+ 1°57 sin (1°2 m— 13°9 
San Blas, Mex 21 32°6/105 15-°7|/D= 0+ 3:37 sin (1°0 m— 877 
iego, Cal ‘32 42°1/117 14°3/D=—12°54+ 1-64 sin (1°2 m—1800 
M 36 36°2)121 53°6|D=—12°82+ 3°54 sin (1°0 m—142°9) 
an Francisco, Cal. (37 47°5/122 27-2) D=—13°504 3:10 sin (1-0 m—132") 
C. Disappointment, W.T. 46 16°7|124 02-0|D=—20-72+ 2°81 sin (1°2 m—188°8) 
Sitka, Alas 57 02 "9/135 - |D=—29-08— 0-010m + 0°00098m? 
Unslacka Island, Alaska. 53 52°6'166 31°5| D=—20:05+4 0°024m + 0°00080m? 
In the second table are exhibited, for each locality discussed, 
the observed and computed declinations (by a formule), 
expressed in degrees and fractions of a deg 
TaBie II. 
—————— 
Year. Obsd. Compd.| Year. Obsd. Compd.} Year. Obsd. Compd. 
Halifax. N. 8. Quebec, Can. York Factory. 
1756-5 +12°83 +12°85|1649°5 +16°O +16734/17255 +19°°0 +19°-04 
1775°5 12°58 14°05 | 1686°5 15°5 1544117875 +5°0 +493 
1798-5 16°50 15°76 | 1810°5 110 11°25/1819°'7 —600 —606 
1818-0 17-47 17°25 | 1814°5 11°83 11°67 | 1843°5 9:42 —905 
1821-7 17-60 17°52 | 1831°5 13°62 13°54/18576 —762 —T95 
) . . . ¢- 6 
1860°5 19°92 
18663 +2109 +19°97|}18595 - 16°28 16°97 
1860°8 +1647 +1604 
