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)

282

MAGNETIC OBSEEVATIONS.

K — Moment of inertia of the magnet, including its suspending stirrup and other
appendages.

tz = Ratio of the circumference to the diameter of the circle = 3-1415927. . .
]x. = The increase in the magnetic moment of the magnet, produced by the inducing

action of a magnetic force equal to the unity of the English system of

absolute measurement.
r0 = Apparent distance between the centres of the deflecting and suspended magnets

in the observations of deflection.
r = Distance corrected for error of graduation and temperature.
u0 = Observed angle of deflection.

P = A constant depending upon the distribution of magnetism in the deflecting

and suspended magnet.

m = Magnetic moment of the deflecting or vibrating magnet.

X = Horizontal component of the earth's magnetic force.

~ = Approximate value of
X0 X

-=7 = Value of -=p before the application of the correction
X X

(-!)■

Formulae for calculating mX:

T, = Tn 1 —

oca )

0 I 86400 16

Formulae for calculating

X

= Va r3 sin uQ.

tri ( P \
~ X I1 ~

m
~X

In reference to our observations of Intensity in general, and particularly to the
instruments employed, we add the following details:

T0 (= observed time of one vibration of the magnet). The time was noted at the
precise moment when the point of the scale most distant from the centre