14
DOCUMENT
3
APRIL
1914
[Vol.
5,
Doc.
428],
and illustration
no.
1
in this volume for Ehrenfest’s sketch
of
the
layout
of
the
office).
[7]Elsa
Einstein (1876-1936). A recent
divorcée,
she is
referred to
by
her
married
name
in
Vol.
5:
Elsa
Löwenthal
(see
Einstein
to Elsa
Löwenthal,
27
December
1913-4
January
1914
[Vol.
5,
Doc.
498],
note
3).
In the
correspondence
with
her
that is still
extant,
Einstein last
addresses
her
as
“Löwenthal-Einstein” in
spring
1913
(see
Einstein
to Elsa
Löwenthal, 3 April
1913
[Vol.
5,
Doc.
436])
and
simply
writes “Einstein” at the
beginning
of
the
following
year (see
Einstein
to
Elsa
Löwenthal,
28
January
1914
[Vol.
5,
Doc.
508]).
In this volume she will be
referred
to by
her
maiden
name.
[8]Marcel
Grossmann
(1878-1936)
was
Professor of
Descriptive
and
Projective Geometry
at the
ETH. For his collaborative work with Einstein
on an early
version
of
general relativity
(the
“Entwurf”
theory), see
Vol.
4,
the editorial
note,
“Einstein
on
Gravitation and
Relativity:
The Collaboration with
Marcel
Grossmann,”
pp.
294-301.
The
investigation
that Einstein refers to
is
Einstein
and
Grossmann
1914b
(Vol.
6,
Doc
2).
[9]At
issue
is
a key
result of Einstein’s relativistic
theory
of
gravitation, namely
the
prediction
of
light
deflection
in
a
gravitational
field,
a
phenomenon
first derived from the
equivalence principle
in
Einstein 1911h
(Vol.
3, Doc.
23).
Erwin
Finlay
Freundlich
(1885-1964)
was
Assistent at
the
Royal
Prussian
Observatory
in
Neubabelsberg near
Berlin. From
as
early
as
1911
on
he had made efforts to
test
general relativity using
astronomical
data
(see,
e.g.,
Einstein to
Erwin
Freundlich,
1
September
1911
[Vol.
5,
Doc.
281]
and Freundlich
1913;
see
also Hentschel 1994
for
a
historical
discussion).
[10]See
Freundlich
1914a
and
1914b,
in which observational data
by
the
Englishman
John Ever-
shed
are
used
(see
Evershed
1913).
See also Forbes
1961,
Earman and
Glymour
1980,
and Hentschel
1992 for historical discussions
of
the solar
redshift
problem.
[11]A
reference to
the
planned
joint
family
vacation in Switzerland
mentioned
in the
preceding
document.
[12]Tatiana (1905-1984)
and Anna
(1910-1979).
[13]Sonya
Alekseyevna
Afanas’yeva,
Tatiana’s
paternal
aunt.
3.
To
Mileva Einstein-Maric, Hans Albert and Eduard
Einstein
[Berlin, 10
April
1914]
Meine Lieben!
Der Rektor hat
ein Einsehen
gehabt.
Er
gefällt
mir
sehr
gut.
Es wird besser
dort
sein als
ich
dachte
Religionsunterricht
lutherisch.[1]
Haber ladet
Euch
ein,
bis die
Wohnung
in
Ordnung
ist[2]
Vergnügte
Ostern[3]
wünscht
Euch Euer
Papa.
AKSX.
[75 766].
The
postcard
is addressed “Herrn Tete
[Eduard]
Einstein
Hotel Beau
Rivage
Locar-
no,”
and
postmarked
“Berlin
15
10.4.14. 10-11V[ormittags].”
[1]Though
he
only
arrived with his mother
ca.
19 April
in
Berlin
(see
Doc.
6,
note
4),
Hans Albert
Einstein (1904-1973)
was
registered
on
15
April
for
the
sixth
form
(“Sexta”)
of the
Arndt-Gym-
nasium
(see Archiv-Zeugnis, GyBAO,
Album
no. 709),
which included
an elementary
school. It
was
located
at Königin-Luise-Str. 80, Berlin-Dahlem;
the director
was
Martin
Kremmer
(1864-?).