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)

368

magnetic observations.

INTENSITY.
1. Horizontal Intensity.

A. Vibration.
1857,'January 6, 4h 50m p.m. local time.

„ . . .• „ . , , ( L 1 ( 20-1 C, 68-2 Fahr.

Magnet vibrated I „ , Temp. I

( L 1 with ring ^ \ 19-8 C, 67-7 Fahr.

Chron. II, losing Is- 0.

Without
ring.

No. of vibrations....... 559

beginning..... 80

ending....... 10

Torsion (90°) ......... 7'

Semiarc

With
ring.

290

60

30

7'

Without
ring.

Time of 1 vibration .... 2 • 949

q = 0-00020
= 0-00017
Time of 1 vibration corr. 2-959

With
ring.

7-943

0-00020

0-00017

7-970

log K, = 0-43696 log K = 0-43821

log mX = 0-49021.

B. Deflection.
1857, January 7, 10h 45m a.m. local time.
Magnets: Deflecting Ll, deflected #21.

Deflection bar: 113. Distances: 1 foot, 1-3 foot. Temp.

12- 8 C, 55-0 Fahr.

13- 3 C, 55-9 Fahr.

1 foot.

O III

u0= 6 57 39
jj. = 0-00017

m = 0-4309

1 • 3 foot.

O / //

3 9 23
0-00017

Temp, of magnet

log ^ = 8-77863

1-3 foot.

1-3 foot.

O

O

13-3 C.

13-9 C.

56-0 Fahr.

57-0 Fahr

= 0-00020

0-00020

7-175



2. Dip.

1857, January 6, 3h 25ra p.m. local time.
Dip needle: No. 2. Temp.: 20°-6 C, 69°-1 Fahr.
End A.

o /

Face to instrument 43 19-65 , 0 '

„ „ „, Mean a = 43 20-45
iace reversed ... 43 21-25