DOCS.
431,
432 JANUARY
1918
439
431.
From
Hugo
A.
Kruss
[Berlin,]
Ministry
of
Culture,
6
January
1918
Esteemed
Professor,
Many
thanks
for
the
interesting
statement
by
Schweydar.[1]
Concerning
Dr.
Freundlich,
I
spoke
with
P[rivy] C[ouncillor]
Müller of
the
Astrophys.
Obs. in
Potsdam.[2]
He would
like
to consider
the
matter for
a
few
more days.
Perhaps
you
could
provide
him with
a
few
more
details
about the
matter in
a
few
lines and
persuade
him
a
little.
With
best
regards, yours very truly,
Krüss.
432. From
Pieter Zeeman
Amsterdam, 158 Stadhouderskade, 8 January 1918
Highly
esteemed
Colleague,
With the
same post
I
permit
myself
to send
you
as
printed
matter
a
short
Dutch
paper
about
some
experiments regarding gravitation
as
well
as on
the
inertial
and
ponderous
mass
of
crystals
and radioactive substances.[1]
I
hope
that
you
will
allow
me
to indicate
very briefly (also
because
the
English
translation
of
the
paper
is
not
yet
ready)
the
results
of
the
communication.
Weight
determinations
of
quartz
spheres
with
horizontally,
then
vertically po-
sitioned
axes
prove
that
at
the
new
orientation,
the
weight
does
not
change by
1
to
26 000
000.-These
experiments
were
conducted
a
while
ago.
Experiments
with the
torsion
balance,
performed according
to
the method
by
Eötvös,
on
quartz cylinders prove
that
an
influence of
the orientation
of
a
quartz
crystal
on
the
proportion of inertial and
ponderous
mass
must
be smaller
than
1
to 30
000
000.

Similar
result
for
calcspar.

As
regards
radioactive
substances,
it
is
shown
that
for
uranyl
nitrate,
the
proportion
mentioned deviates
less
than
1
to
5,000,000
from
the
proportion
of
masses
for
quartz.[2]
In
the
case
of
uranium
oxide, initially a larger discrepancy
was
found,
which
is probably
attributable
to
admixtures
of
traces
of
iron.
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