and parts of adjacent States. 361 
Dunkirk, N. Y. 42 29°3 
Ellicottsville, “ 42 18°1 
« 20:8 
a ? 
Silver Lake, Penn, 41 56°6 
Comparison of Declination for secular change. Results of 1840-41 and of 1862. 
1862. . Annual 
oe (Schott.) |Increase. 
Philadelphia, Girard College, | July & Nov, 1841 | 3° 53""7 W./5° 00/0 W.! 3/2 
Harrisburg, July, 1840|3 12°5 © |3 44°5 «| 15 
Williamsport, “ 1841|3 ‘31-2 |4 25-7 «| 96 
Johnson’s Tay. near Brownsville, Aug, 1840olo 25:2 “|1 13-6 «| 2:2 
Erie, . 1841|0 30°00 “ |1 33-0 « | 3-0 
Bath, «“ 1841|3 31-4 * |4 47°9 “| 3-6 
Mean, | 2°7 
_ Harrisburg was occupied in July 1862, and all the other sta- 
tlons of 1862 in August. 
Longitude. 
By Chronom. | Ftivey. | adopted.” | adopted 
trie p C8 sea f oY otto 
Wilhamsport.) 77 01-3 7 OS'S 77 02 
Curwinsville, 78 36:6 78 35 78 36 
ie — o 12°5 80 05 80 06 80 06 
unkirk, 79 27:0 79 22 79 22 79 23 
Ellicottsville, | 78 46-6 78 42 78 44 
Silver Lake, | 75 593 76 05 76 02 
Milford, 4 53-1 74 50 74 515 
Distribution of the Magnetic Declination for the epoch 1842-0. 
From the comparison of observations for secular change, we 
ve: 
From the preceding 6 stations the average annual increase 2'"7. 
os Toronto (between 1845 and 1855) 2'3 (see vol. iii of the 
9rento Observations). ; 
General table of results referred to the common epoch 1842-0. 
No. u Observed decl. Re’d to Declination 
Station. Date. Ww. bh 1842-0. : 
1 | Harrisburg, 1840, July 25 3 125 +40 3165 
;: ‘ « 30 r-52-3 Tt 
Near Pittsburg, wi Aug, 10 o 080 “ oO 12:0 
4 Near Bro ville, “ ug: 17 o 25°2 “ Oo 
| 5S |Near Mercersburg,| “ «34 0 544 ng o 58-4 
PS Baltimore, “* veo 2 16°5 “ 2 205 
| 7 |Philadelphia, | 1841, {SUP | 3537 | 407 | 3 544 
he « July 3 38-0 +13 39 
9 | Williamsport, ‘ w Bd 3 ors 3 32-5 
10 | Curwinsville, #. Aug.3 1 45°1 &“ 1 46° 
11 | Mercer, “ «©. 4{ -o0 512 “ -0 499 
12 | Erie, “ “ 0 300 “ o 31: 
13 | Dunkirk, “ “ 12 o 525 “ o 53:8 
14 | Ellicottsville, “ “ 34] 2 357 “ 2 37-0 
15 | Bath, | “ y 3 31-4 «“ 3 32-7 
16 Silver Lake, “ “ 9 30° “ 4 315 
* Colton’s Map, 80° 10’. 2 Tbid., 79° 22-5. 
