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)

390

magnetic observations.

INTENSITY.
1. Horizontal Intensity.
A. Vibration.
1855, January 29, 8h a.m. local time.

Magnets vibrated j _ 1 , Temp.: 26°-7 C, 80°-0 Fahr.

f L 1 with small ring.

Chron. H, losing 0s-3.

Without
ring.

No. of vibrations....... 400

Semiarc j befning " " " " " 178"5
I ending....... 41

Torsion (90°) ......... 4'

With
small ring.

180

228

163-5

4'

Without
ring.

Time of 1 vibration .... 28-467
q = 0-00020
p.^ 0-00017

Time of 1 vibration corr. 2s-470

With
small ring.

5s-262
0-00020
0-00017
5s-268

log K, = 0-33293 log K = 0-43821

log mX = 0-64719

E. Deflection.

1855, January 30, 8h 30m a.m. local time.
Magnets: Deflecting Ll, deflected B5.

Deflection bar: HI. Distances: 1 foot, 1-3 foot. Temp.: 30°-0 C, 86°-0 Fahr.

1 foot
u0 = 6° 54' 55"
[>. = 0-00017

1-3 foot.

3° 7' 23"
0-00017

1 foot.

o

Temp, of magnet 30-0 C.

86-0 Fahr.
q = 0-00020

1-3 foot.
30-0 C.
86-0 Fahr.
0-00020

log ^ = 8-77407

m. = 0-5136 X = Horizontal Intensity = 8-641

2. Dip.

1855, January 30, 6h 30m p.m. local time.
Dip needle: No. 2. Temp.: 29°-0 C, 84°-2 Fahr.
End A.

Face to instrument 12 18-8
Face reversed ... 12 5-5

End B.

O I

Face to instrument 11 35-5
Face reversed ... 11 57-5

o /

Mean a = 12 12-15

Mean fi = 11 46-5

Mean of the dip = = 11 59-33

Dip corrected for error of needle . . . . 11 59-68