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)

342

magnetic observations.

INTENSITY.
1. Horizontal Intensity.
A. Vibration.1
1856, February 6, 2h p.m. local time.

L , ( LI ( 20-1 C, 68-2 Fahr.

Magnet vibrated { ■ . , , lemp. I

I LI with ring. ^ I 20-4 C, 68-7 Fahr.

Chron. H, losing 03-2.



Without

With



Without

With



ring.

ring.



ring.

ring.

No. of vibrations . .

400

220

Time of 1 vibration . . .

2-814

7-518

( beginning
Semiarc j

. . . . 129-5

49-5

132
110

1

= 0-00020
= 0-00017

0-00020
0-00017

Torsion (90°).....

0'

log Kt = 0

0'

•43858

Time'of 1 vibration corr. .
log K = 0-43821

. 2-821

7-587

log mX = 0-53157

. B. Deflection.
1856, February 6, lh 30m p.m. local time.
Magnets: Deflecting Ll, deflected J?21.
Deflection bar: HI. Distances: 1 foot. Temp.: 19°-1 C, 66°-4 Fahr.

1 foot.

u0 — 6° 46' 55"
a = 0-00017

1 foot.

Temp, of magnet 19°-1 C, 66°-4 Fahr.
q = 0-00020

log ~ = 8-75489

m = 0-4398 X = Horizontal Intensity = 7-733

2. Dip.

1856, February 5, llh a.m. local time.
Dip needle: No. 2. Temp: 16°-5 C, 61°-7 Fahr.
End A.

o /

Face to instrument 38 19-1 ° '

Mean a = 38 24-4

l'ace reversed ... 38 29-7

1 In order to expose our standard chronometers as little as possible, we used for the vibration chronometers
" W and u A" by Dent, and 5 by Grant, their rate being referred, by comparison, to the standard chronometer.
Compare p. 283..