154 | MAGNETIC OBSERVATIONS. 
OBSERV ATIONS— Continued. 
Station, Cambridge Observatory ; latitude 42° 22’ 48" ; longitude 4h. 44m. 29. 6s. 
Needle, B. Date, May 10, 1854. Hour of beginning, 11h. a. m. ; hour of ending, 11h. 30m. a. m. 
۰ Observers, Professor W. C. Bond and Lieut. J. C. Ives. 
° , " 
A 14 48 
Needle vertical, face of circle north, reading of azimuth circle 7 و‎ 
14 47 
Needle vertical, face of circle south, reading of azimuth circle ç 1 2 
Reading of azimuth circle when plane of instrument is in the magneti idi 14 49 20 
Reading of azimuth circle when plane of instrument is in the true meridian 5 04 
Approximate magnetic declination 9 45 20 W. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 2. 
N. P. needle A 400 S. P. needle A 400 
from dip. from dip. 
Face of circle. Direct. Results. 
aji” Bor o * p 
at34 25 |at114 25 | at 34 25 | at 114 25 
o ۴ oO , o 1 [o] 1 ° 7 ° 1 n" 
74 95 40 53 20 95 12 52 48 " 
Fast 74 25 | 95 38 | 53 15 | 95 20 | 52 55 COMO, pes. 
94 3 95 35 53 15 95 20 52 58 Se 7 
4 5 
S 74 55 i By deflectors. 
Se s> 95 35 53 95 40 53 10 
West. 74 98 95 30 53 00 95 40 53 08 l 
7 95 30 53 10 95 45 53 15 Í 
o , H ^ o 4 n o r ” 
oi 24 95 34 40 95 29 30 74 21 10 | Mean. 
53 10 50 53 02 20 
o , “ ° , ” 3 
Bon mons... 148 45 30 148 3E -.650 
a} 
o , 7 7 " 8 
Esfini رہم‎ .. ........ 14 22. 45 74 . 3154 85 + 8 48 $ Index error. 
i E 
: Š 
: o , a o Ze J 3 
Differences 42 24 50 a MES 18 i 
0) o , " o 7 7 ° , "m | 
Half diff. — anglesof deflection.) 21 12 25 231 IF 35 74 29. 58 | True inclination. 
5 
