DOCUMENT
58
OCTOBER
1899 237
tive
elektrische Kerne sind ohne
ponderable
Masse, welche die
thermischen und
elektrischen
Erscheinungen
in
Metallen
bedingen" (Doc.
96).
Though
Einstein
was
aware
of the
difficulties in
explaining magnetism
on
this
basis,
he
believed that Drude
was
"auf dem
richtigen Wege" (Doc.
97).
Einstein continued
to
work
on
his
own
theory
of
thermoelectricity
for
a
time,
but decided
not to
publish
it
(see
Doc.
110).
A paper
by Reinganum[9]
that
derives the Wiedemann-Franz
law
from
more
general
assumptions
than Drude's convinced Einstein
that
the fundamental
principles
of the
electron
theory
were
correct
(Doc.
111).
Nevertheless,
Einstein had
two
specific
objections
to
Drude's version of the
theory
(see
Doc.
115),
as
he
pointed
out in
a
letter
to
Drude
(see
Docs.
110,
112).
He
was
gravely disappointed
by
Drude's
reply
(see
Docs.
114,
115).
The
nature
of Einstein's
objections is
not
known,
but
a
number of
criticisms
of Drude's
theory
were
published.
Reinganum pointed
out
that
the
large
number of
freely
moving charge
carriers
assumed
in
a
metal should
give
rise to
a
much
higher
value of the
specific
heat than
is
observed.[10] He
also noted that Drude did
not
take into
account
the
velocity
distri-
bution of the
charge
carriers. Drude assumed that
currents in
metals
were
carried
by
charges
of both
signs,
while
Thomson's work
suggested
that
such
currents
were
carried
exclusively by
negative
charges.[11]
[9]
Reinganum
1900
(see
Doc.
111,
note
6).
[10]
This
problem
is
mentioned
in
Einstein
1907,
p.
187.
[11]
See
Thomson,
J., 1900.
Other
objections
were
also
raised: Hall discovered
a sign error
in
Drude's calculation of the Thomson
effect,
corrected
in Drude 1902.
Drude's derivation
of the Wiedemann-Franz
law
neglected
the
effect
of the electrical
field
on
collision times
in
calculating
the electrical
conductivity
(see
Seeliger
1921,
which
reviews
criticisms of the
classical electron
theory
of
metals).
58.
To Mileva
Maric
Mailand.
Dienstag
[10
October
1899][1]
L[iebes]
S[üßes?][2]
D[oxerl]!
Jetzt
Sie sind
mir
eine Schöne!
Sitzt schon
ganz gemütlich
4
Tage
im
Examen
&
hat kein Schnauferlein
für
ihren braven Herrn
Kollegen
und
Kaffeesaufbrüderchen. Ist das nicht schauderbar? Ich werde mir
eine
Schauer-
predigt
einstudieren und
sie
Ihnen
am
nächsten
Montag persönlich
halten,
und
zwar
in
aller Frühe. Und
wenn
das
Mädchen
sagt,
Sie seien
ausgegangen
&
ich
sehe
Ihre
gewichsten
Stiefelchen
vor
der
Thüre-wie
das
so
manchmal
passieren
soll-dann
warte ich
einfach noch
ein bissel
oder
lasse
mich rasieren.
ALS
(CLE).
[1] Dated
by
the
references in this
letter and
in
the
preceding
one
to
Einstein's
return to
Zurich.
[2]
Underlined
twice in
the
original.
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