Schlagintweit, Hermann von; Schlagintweit, Adolf; Schlagintweit, Robert von: Results of a scientific mission to India and High Asia: undertaken between the years MDCCCLIV and MDCCCLVIII, by order of the court of directors of the hon. East India Company (Band 1): Astronomical determinations of latitudes and longitudes and magnetic observations: during a scientific mission to India and High Asia (Leipzig, 1861)

364

magnetic observations.

INTENSITY.
1. Horizontal Intensity.
A. Vibration.
1856, April 9, 7h 10m a.m. local time.

.LI I 30-9 C, 87-6 Fahr.

Magnet vibrated \ . , . Temp. \

1 LI with ring. 1 ( 31-9 ft, 89-5 Fahr.

Cliron. H, losing Is-3.

Semiarc ,

ending
Torsion (90°) . .

Without

With

Without

With

ring.

ring.

ring.

ring.

. 400

160

Time of 1 vibration . . . 2-819

7-615

130

230

q = 0-00020

0-00020

43

66

jx = 0-00017

0-00017

1'

1'

Time of 1 vibration corr. 2-822

7 • 607

log K, = 0-43471 log K = 43821

log mX = 0-53151

B. Deflection.
1856, April 9, 9h a.m. local time.
Magnets: Deflecting LI, deflected H21
Deflection bar: H3. Distances: 1 foot. Temp.: 31°-5 C, 88°-7 Fahr.

1 foot.

Temp, of magnet 33°-0 0., 91°-4 Fahr.
q = 0-00020

1 foot.
,6 r 0„

fj. = 0-00017

m0 = 6° 7' 0"

m

log ^ = 8-70644
m = 0-4159 X — Horizontal Intensity = 8-176

2. Dip.

1856, April 9, 3h 35m p.m. local time.
Dip needle: No. 2. Temp.: 34°-3 C., 93°-7 Fahr.
End A.

o /

Face to instrument 35 26-1 ° '

Face reversed ... 35 18-2

End B.

o /

Face to instrument 35 5-0
Face reversed ... 35 23-5

Mean a = 35 22-15

Mean £ = 35 14-25

Mean of the dip = — 35 18-20

Dip corrected for error of needle .... 35 18-55