DOCUMENT 74 JANUARY 1908 89
strakt-begriffliche
Art des
Semiten") (see
Arnold Sommerfeld
to
H. A. Lorentz, 26
December
1907,
NeHR,
Archief
H. A. Lorentz).
[2]Einstein's distinction between constructive theories and theories of
principle,
which
is
implied
here,
was
elaborated in Einstein
1919.
See
Vol.
2,
Introduction, pp. xxi-xxvi,
for
a
dis-
cussion.
[3]See
Einstein 1909b
(Vol. 2,
Doc.
56),
§10
for
an
attempt
by
Einstein
to
find
a
relation
between Planck's
constant
and the
elementary
charge
and for his
thoughts
on
possible
modifi-
cations of Maxwell's
equations.
See
also Doc.
153
for
H. A.
Lorentz's
objections
and Doc.
163
for Einstein's
response.
[4]Sommerfeld's lecture
on
signal velocities,
delivered
to
the
meeting
of the Gesellschaft
Deutscher Naturforscher und Ärzte
in
Dresden
in
September
1907 (see
the
preceding
docu-
ment), only
summarized his results. A full
and
extended
publication
was
planned
but
only
re-
alized
five years
later
(Sommerfeld 1912);
it
was
reprinted in
abbreviated form
in 1914
(Som-
merfeld 1914).
See also the editorial
note,
"Einstein
on
Superluminal Signal
Velocities,"
pp. 56-60,
for
more on
Sommerfeld's work.
[5]The preceding
document.
[6]Peter
Paul Koch
(1879-1945)
was
Privatdozent and Assistent
in
experimental physics
at
the
University
of
Munich.
[7]In
a
postcard
to
Einstein,
Johannes Stark had communicated his
plans to pursue
his
ex-
perimental
work
on
canal
rays;
see
Doc.
45
for Einstein's
response
and Doc.
125, note 5,
for
more
on
Stark's work.
[8]See
the editorial note, "Einstein's 'Maschinchen' for the Measurement of Small
Quanti-
ties of
Electricity,"
pp.
51-55
for
more on
the
device.
[9]Einstein
described his work
in
Einstein 1908a
(Vol. 2,
Doc.
48).
[10]Einstein 1907h
(Vol.
2,
Doc.
45), in
which this
argument is
further worked
out.
[11]For
more
on
Einstein's
thought
on
relativistic
rigid
bodies,
see
Einstein 1907h
(Vol. 2,
Doc.
45)
and
Vol.
3,
the editorial
note,
"Einstein
on
Length
Contraction in the
Theory
of Rel-
ativity,"
pp.
478-480.
[12]See note
3.
[13]The
80th
meeting
of the Gesellschaft Deutscher Naturforscher und Ärzte
was
held
in
September
in
Cologne.
74.
From
Adolf
Gasser
[Winterthur, mid-January
1908][1]
Meine lieben
Einsteiner,
Vielen Dank für Ihre freundl.
Zeilen,
wir wollten Ihnen schon
lange
schrei-
ben,
aber
eben,
Sie wissen
ja.
Über
unsere
Familienerlebnisse
mag
Ihnen
meine
Frau[2]
ausführlich
berichten,
die
treffl.
Bemerkungen
der Frau Ein-
stein haben sie
so
weit
gerührt,
daß sie sich
nun
mal aufraffen will.
Sie sind wohl sehr
erstaunt,
daß ich
von
meinem Maschinerl
so gar
nichts
verlauten
lasse,
aber
es
ist alles
so gekommen,
wie
Sie
voraussahen,
der Ab-
wart
hatte während der Ferien
gar
nichts
gemacht
u.
während
des Semesters
behauptet
er
keine Zeit
zu
haben.[3]
Wir stecken halt mitten im Neu
u.
Umbau
drin,
sind auf
geringen
Raum
angewiesen,
so
daß
gegenwärtig
alles viel müh-
samer
geht,
als
sonst.
Hoffentlich können wir bis nächsten Herbst die
neuen
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