MAGNETIC OBSERVATIONS. 
OBSERVATIO NS— Continued. 
159 
Station, Cmmbridge Observatory ; latitude 42° 22' 4871; longitude 4h. 44m. 29. 6s. 
Needle, A. Date, May 10, 1854. Hour of beginning, 1h. 20m p. m. ; hour of ending, 1h. 50m. p. m. 
Observers, Prof. W. C. Bond and Lieut. J. C. Ives. 
Needle vertical, face of circle north, reading of azimuth circle 
e : 
Needle vertical, face of circle south, reading of azimuth circle 
e Reading of azimuth circle when plane of instrument is in the magnetic 
. q. 
Reading of azimuth circle when plane of instrument is in the true meridian 
. Approximate magnetic declination 
30 W. 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 3. 
Def. S. at app. dip. 
Def. N. at app. dip. 
Face of circle. Direct. 
Def. towards | Def. from the) Ther. | Def. towards | Def. from the Ther. 
the vertical. | verti Fah the vertical. vertical. Fah. 
o , o L4 o d o o , ° ” o 
74 35 107. 0 41 05 12 103 45 44 55 72 
East 74 35 107 30 Z£b 49 Load cd 103 43 TE 58 Louol.e« 
tA- 30 107 28 HEAR do 103 40 E BE o 
$ 74 30 101. 25 سوا‎ 686 ۶ 03 0 44 50 77 
West 74 28 307. 32 Zl 35-1. ہو ہے ے‎ 103 40 4 Db ll. 
d 74 35 107 30 4l 20 72 103 38 44 0 72 
ro 4 a ° , 7 [e] o , ” o 
10 . 329 ہو‎ 108 39 20 
Means. 74 30 30 1 A } 72 | oe } 72 
, " 
Cor. for index error of needle...| 十 15 04 
` 
o 1 “ 
Deduced inclination.----------- 74 45 34 
- o r n” o , tr 
Diff. of means 56 HH ML > D O M. — Lo ub 
o D ” o , fr 
Half diff. les of deflecti 2: تج‎ M Lese 29 22 4b Loo 
o , " O , “ 
Sum of meane 148 43 40 EA 148 33 10 EEN 
E o 7 " o , “ 
Half sum — dip f x e GE کہ‎ E M ۔‎ PAPA 
a r bie 3 ES il 
