DOC.
14
PROOF OF
AMPERE'S
CURRENTS
185
708
the strength
of
the
current in the
variable resistance. Besides
we
used
a
resonance
frequency
meter
of Hartmann
and
Braun,
with
which
we
could accurately
determine definite
frequencies
(45
;
45,5;
46
up
to 55).
The intermediate
frequencies
were
interpolated by
means
of the
amperemeter.
The
amplitude
of
the
vibrations
of
the
cylinder was
measured in
the
same way as
in the
former
experi-
ments. However,
in order to
increase
the
precision
we
now took
a
scale
distance of
145
cm.
In
fig. 2
the
results
have been plotted
graphically.
The numbers