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)

352

magnetic observations.

End A.

o /

Face to instrument 29 0-4
Face reversed ... 29 25-8

End B.

O I

Face to instrument 29 17-2
Face reversed ... 29 30-6

Mean a — 29 13-1

Mean 0 = 29 23•9

Mean of the dip = g t" ^ = 29 18-50
Dip corrected for error of needle . . . . 29 18-85

No. 9. Calcutta, in BengIl.

Latitude North. Longitude East Green. Height.

22° 33' 1" 88° 20' 34" L. a. L. S.

On alluvial soil, in the botanical garden, right bank of the Hugli. See p. 147.

Observer: Hermann.

FIRST SERIES.
DECLINATION.

1856, March 24, lh 30m p.m. local time. Collimator 1; Theodolite 3, Troughton; Chron. 3.

o /

Magnetic meridian............................ 349 16-0

True meridian (see p. 148)...................... 346 47-6

Declination East .... 2 28-4

INTENSITY.
1. Horizontal Intensity.
A. Vibration.

1856, March 22, 2h 55m p.m. without ring, 4h 7m p.m. with ring, local time.

, ( il ( 31-9 C, 89-4 Fahr.

Magnet vibrated \ _, . lemp. I rt nn n „ .

I LI with ring. ^ ( 31-1 C, 88-0 Fahr.

Chron. H, losing 0s • 5.

Semiarc ]

( ending

Torsion (90°) . .

Without

With

Without

With

ring.

ring.

ring.

ring.

600

80

Time of 1 vibration .... 2-762

7-489

150

170

q = 0-00020

0-00020

30

120

p. = 0-00017

0-00017

1'

1'

Time of 1 vibration corr. 2-763

7-454