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DESCUSSION OF THE MAGNETICAL AND METEOROLOGICAL OBSERVATIONS MADE / T THE GIRARD COLLEGE,. PHILADELPHIA 
IN 1840, 41, 42, 43,44 £45 D.BACHE L LD. SUPERINTENDENT 
DIAGRAMS TO PART }. si 
Flo tor ee ee Ptr es re oe A 
ave. ae Solar-diurnal Variation of the Declination 9 ees | a be = i | m i 
" s | Paty Fo "TT Ce ere st PP TP ee ee is : HOO 
19 | = ‘Le 180 
x 74 L | L— +89 3 nod < ’ 
ace — * — 160 
1 76. —+— i —— seamen Oe OF lice! —— i a 3 — 140 
¢ 78 - | | | —| | 3 ‘20 ., gd es 
fs 80 L | | Slee 1 aR co 
Cy | | . - ~s Ys e102 
2 esi Diagram A. i ae . Glad Saale 
_ 82 2 | bi ~~ jixy ” — 180 
E BA y | a — ‘60 : 3 . tee 
pe a OO SRG: Sst 1840- r- “40 al : eas 
- 62 L | joe 
_ eee 4 ae pie em Pipe 
o. 64 a! 7-00 * se = 2 Lstee s 
r-) [oy 49 | ween | 184% | 1843) é, =| [1840 = (Laas B42 tas 1844 Ah 
o 66 a ae 
ae Middle of each vear : 80 ' * : 
68 kel bok ref Fe eS ike 
: 54 570 Mee ee tae Middle of each year 
BG. 72 [einen een Diurnal Dist Variation of the Dechnati 
my T T ae eS 
58 74 z mee a rv) re TT I 1 ] : 2 
60 76 oi 2 ‘J 
2 78 a 5 
564 80 1842 ae Diagram a. 4 
ae Pee R 
66 _ - 0.2 ee ml zi 
68 - © ae Can EO one : at | 
70 + - 0.2 nee me Be ie 
2 = OA q ae | ne 
562 | —1843——— - 6.6 : ; | 4 
40 64 . Phila delphip mean time ‘ | ' 
A2 66 - st - 6 8 WW toa we okt 
44 68 - + | a TE A | 
16 °° 46.70 4 Sad Ge ares eles hu | eS Bk SON tes Bs es oe ae | 
18 548 45 1844 ss -“ 
20 50 3 “4 st & 
eo SG . | | + | 
24 64 5 | + Wont Oh | 
2656 4 + “| _Diagr “um. LY : rt | 
a28 se 3 1845 -— | = ) 
30 a | ~ § | a | 
° ° Pd _ } 
32 er ‘ a s | \ 
34 e |’ - 3 a | 
c eS 3 | ery | 
sO ; - | | ae 4 | 
3 | t | | | 
38 bp te pres aa | ae . : 5 BR poe Lat = 1a | 1p42 | 183, 1844 ny | 1Bt6 18H7 ) IBA 19 | 1859 | 1861 | 
: on OSes a, eS, a ae. Le ie wet Bs eH al ne oe [| fy 3849; 3841, Jpeg | tes 1844 B46 | 18A7 ) 18RD | 1B5Q | AB | 
ean time 
eset ; <a — ee SE Pest = 
