DOCS.
47,
48
JANUARY
1915 63
delivery
deadline.[10]
In this time
I
hastily pieced
together
the
two articles
as
best
I
could.
So
please:
do
not
punctiliously
weigh
every
word!
Regarding
the
erroneous
view
that the
Lorentz contraction
was
“merely apparent,”
I
am
not
free from
guilt,
without
ever having myself
lapsed
into
that
error.
It
is
real,
i.e.,
measurable
with
yardsticks
and
clocks,
and at
the
same
time
apparent
to
the
extent
that
it
is
not
present
for
one
with
moving
observers.
Finally,
as
far
as
the
question
of time
is
concerned,
we are
scarcely going
to
be able to
debate this
effectivly by
letter.
I shall be
glad
to
come
to Holland
again
to discuss this and
other
matters,
when
the
sorry
international
entangle-
ment
is
finally
overcome.
I
am
satisfied
if
you agree
with
me
that
I
did not
set
the
monstrous
boundary
condition
for
the
vanishing
of
the
Axv's for
justi-
fied
transformations
(otherwise
my
beloved house of cards would be
irretrievably
lost).
With
cordial
greetings, yours,
Einstein
Best
regards
to
your
wife,
Ehrenfest,
and
Kamerlingh-Onnes.[11]
48. To Hans Albert Einstein
[Berlin,]
25
January
1915
My
dear
Albert,
From Hans
Wohlwend[1]
and
your
aunt
in
Lucerne[2] I
hear
that
you
and Tete
are
well
and
that
you
have
a
pretty apartment
by
the
hill in
Zurich.[3]
I
also know
that
you
were
allowed
to
have installed
on
your
sled
the
steering
fixture
that
you
have been
wanting
since last
year.
You have found
your
old friends
again
as
well,
I
hope,
with whom
you
had
always
tussled and
romped
about
on
Zurich hill.
Nowhere
else
is
it
as
nice for
boys as
in
Zurich,
nor so healthy
either.
Boys
aren’t
pestered
too much with homework
there
either,
nor
with
the
requirement
to
be
overly nicely
dressed
and well-mannered. Just don’t
forget your piano!
If
you
can
play
music
nicely,
you
can give
yourself
and others much
pleasure
with it.
This
evening,
for
example,
I’m
playing along
in
a
little
concert,[4]
the
proceeds
of
which
are
supposed
to
help
two
impoverished
artists.
In
a
few
years you
will
also be able to
begin exercising your
mind. It’s
splendid,
once
you
can
do it. In
the last
few weeks I
have been
doing
a
wonderful
and
important
experiment
on
magnets
with Mr. de
Haas,
who visited
us once
in
Dahlem,
as
you
know,
with his
wife
and his
little
children.[5]
When
I
spend
some
more
time
with
you one day,
I’ll
tell
you
a
bit about
it, maybe already
during
the
next
summer
holidays.
In
the
summer
I
hope
to
go on a
walking
tour
with
you
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