DOCUMENT
52
AUGUST
1899 225
Einstein makes
no
further mention
in his
letters of work
on
the
electrodynamics
of
moving
bodies for almost
two
years.
However,
the inclusion of "die
prinzipielle
Trennung
von
Lichtäther und
Materie,
Definition absoluter Ruhe"
among
the
topics
he
discussed with Besso
in
April 1901
(Doc.
96)
indicates
his
continued interest
in
the
subject.
In March
1901,
he wrote
Maric that
he
looked forward
to
the
successful
conclu-
sion of "unsere Arbeit über
die
Relativbewegung"
(Doc. 94).[10]
In
September he wrote
Grossmann
that
he
had devised
a
simpler
method for the
investigation
of the
mo-
tion of
matter
relative
to
the
ether,
based "auf
gewöhnlichen
Interferenzversuchen"
(Doc. 122).
By
December
he
was
hard
at
work
on an
electrodynamics
of
moving
bodies,
which
promised
to
become "eine
kapitale Abhandlung" (Doc.
128).
A
calcu-
lational
error
had
earlier
led
him
to
doubt the
correctness
of
his
"Ideen über die
Relativbewegung,"
but he
now
believed
more
than
ever
in
these ideas
(ibid).
He
ex-
plained
this work to
Professor Kleiner, who
encouraged
him
to
publish
both
his
theoretical
and
experimental
ideas
(see
Doc.
130).
In
spite
of Einstein's enthusiasm
and Kleiner's
encouragement, no
publication
on
this
subject
ensued for
over
three
years.[11]
In Einstein's
final
reference
to
this
subject
in
this
volume, he states his
inten-
tion
to study
"was Lorentz und Drude über die
Elektrodynamik bewegter Körper
geschrieben
haben"
(Doc.
131).
[10]
See
the Introduction
to
Volume
1
for
comments
on
the
nature
of
Maric's collab-
oration with Einstein.
[11]
Einstein
1905c is
datelined June
1905.
52.
To Mileva Maric
Paradies
[Mettmenstetten,]
Donnerstag.
[10?
August
1899][1]
L[iebes] D[oxerl]!
Vielen
Dank für Ihr
Brieferl,
das
ich
schon wieder beantwortet
hätte,
wenn
ich
nicht mit
unserm
Wirt[2] eine
Fußtour
ins
Gebirge gemacht
hätte, die
übrigens ganz
wunderbar
war
(Zug-Einsiedeln[3]-Züricher Obersee).
Hof-
fentlich
haben
Sie
mein
erstes Brieferl bekommen,
wenn
auch nicht
grad
viel
ALS
(CLE).
This letter
may
have been
en-
closed
in
an
envelope
addressed
in
Ein-
stein's hand: "Fräulein Mileva Maric
Katy
bei
Neusatz
Ungarn." A postmark,
"[Me]tt-
menste[tten]," is only
partially
legible
be-
cause
of
cropping.
The
verso
of the
envelope
bears
two
docketed
postmarks: "Ujvidek
99-
Aug.
14
8"
and
"Katy
99
Aug
15."
On the
verso
Einstein's mother has written: "Gruß.
P.
Einstein." and
Maja
Einstein:
"Ich
hätt'
Ihnen auch
gern geschrieben,
aber
A.
hat's
nicht erlaubt. M."
[1] Dated
by
the reference
to
Maric's
re-
ceipt
of Einstein's
first
letter from Mettmen-
stetten
(Doc.
50).
[2]
Robert Markstaller
(1865-1933), owner
of the Hotel-Pension Paradies
(see
Staats–
steuerregister 1900,
SzMet-Ar, IV
B
29d).
[3]
Site
of
a
famous Benedictine
abbey
in
the
canton
of
Schwyz.
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