94 
MAGNETIC OBSERVATIONS, 
OBSERVATIONS—Continued. 
Station, Camp 65, Hay Camp ; latitude 35° 4’ 59". 69 ; longitude Th. 10m. 36.85. 
Needle, Bag Date, November 15, 1853. Hour of beginning, 4h. p. m. ; hour of ending, 4h. 45m. p. m. 
Observer, Lieut. J. C. Ives, Topographical Engineers. : 
Needle vertical, face of circle north, reading of azimuth circle 
Needle vertical, face of circle south, reading of azimuth circle 
Reading of azimuth circle when plane of instrument is in the magnetic meridian 
Reading of azimuth circle when plane of instrument is in the true meridian 
Approximate magnetic declination 
A 
p 
AAA NNO‏ ده 
= 
== 
> 
ډب‎ 
bo 
e 
Ca 
e 
e 
Ku 
a 
e 
OBSERVATIONS FOR MAGNETIC INCLINATION AND INTENSITY—No. 4. 
Instrument-stand rested upon a bed of lava during these observations. 
Def. with wt. 2 gr. Def. with wt. 23 gr. 
Face of circle. Direct. | : 
Def. towards | Def. from the Ther. | Def. towards | Def. from the Ther. 
the vertical. vertical. Fah. the vertical. vertical. Fah. 
(1) ) (1) (2) 
° , ° , “O , ° [o] 9 , o 
352.85 63... 10 7 8 65 11 30 30 65 
East 35 3 63 15 SS NUN E TL 25 uo ASE 
85 0 63 08 T JE AA Tl ^80 28 |... Causa 
. 85 23 63 30 TO LII ce CL 33 qb 1022. 
West 85 63 20 人 TAS BT E EE 
35. 90 63... 28 T 208 65 71 40 38 65 
, " "m [o] 0 7 " 
M () 63 18 30 GY TE 34 90 
eans € 1 (2) 7 14 0 65 (2) Mier pocos 
| 
| 
Corr. for index error of needle..| +8 48 
: [e] , " 
Deduced inclination ........... 35 39 08 
o , ". [5] r r 
Differences B6..04 J] e E 40 89... ` a 
" 0 , ” O , " 
Half diff. or angles of deflection dë En را‎ Oe a OU. 85 289 60“ yp 
| 
O , " | 0 D " 
Sum of means = 70 32 50 LS A nou 
۱ O , ” ۱ 0 , " 
Half sum = dip leese ee 35 16 25 7000007 $6 94.40 —  Luscwsz- 
A 1 E Kee | 
dl 
| 
