212
DOCS. 292-294 OCTOBER
1911
292.
From
Willem Julius
Utr[echt],
11
October
1911
Highly
esteemed
Colleague:
May
I
remind
you
that the
faculty
of Natural
Philosophy
is
still
waiting
for
an
answer
from
you as
to
whether
you
would, perhaps,
make
the
acceptance
of
an
appointment
to
Utrecht
contingent upon
some
condition
(minimum salary,
teaching aids,
or
whatever).[1]
Because
when
we
submit
the
proposal
we
would have to
let the
government
know
about
these
things.
In
the meantime
a
change
has
been made
in the
faculty
committee; I
am now
the
chairman,
and
Prof. N.
Schoorl[2] is
the
secretary.
With
best
regards,
yours
truly-
293. To
Hans
Tanner
Zurich, 13
October
1911
Dear
Mr.
Tanner:
In
response to
your inquiry,
I
am
pleased
to inform
you
that, in
my
opinion,
your
study
on
the
equation
of
state
of
slightly
compressed
gases
is
certainly
suitable
as a
doctoral
dissertation.[1]
The
correctness
of
your
deductions
is indisputable,
and the results
regarding
the
order of
magnitude
of
the
sphere
of action and
the
value
for the
potential
energy
of the attractive
forces
is
very interesting.[2]
With
best
regards, I
remain
yours,
A.
Einstein
294.
From
Ludwig
Hopf
Aachen,
Lousbergstr.
72, 13
October
1911
Dear
Mr.
Einstein,
I
looked for
you
in
vain
at
the
railway
station
in
Heidelberg[1]
in
order
to
say good-
bye
to
you
and thank
you again
heartily
for
the
many
hours
you
devoted
to
me during
the
past 3
semesters.[2] Now
you are
probably
in
Prague
again
and
can
immediately
convey my
thanks
to
your
wife
for
all the
kindness
she has shown
me
during
this time.
It
was a very
nice time for
me,
and
even
if
the radiation
problem
has not
been
brought
much closer
to
a
solution
through
my assistance,
at least I
understood
this
problem
after
a
sort.
My
work
here
is
not
yet
exciting.[3]
My
wind
tunnel
is
not
yet ready, a
few machines
must be set
up first,
and it
is
better
if
I keep
my
hands off
it.
The
experiments promise