DOCUMENT 128 NOVEMBER 1908 149
Atherwirbeltheorie der
Materie,
in welcher Äther und Materie
wesensgleich
sind,
am
ehesten
zum
Ziel
führt.[14]
Dieses Bild muß dann
vor
allem
die
De-
formation
erklären,
die ein Ätherwirbel durch Translation erfährt. Die Poin-
caresche
Hypothese
eines Atherdrucks würde dann
aus
dem Atherbilde her-
aus zu
erklären
sein.[15]
Das scheint mir sehr schwer
zu
sein. Der einstweilen
gewonnene Standpunkt,
daß
man
rein
phänomenologisch
alles berechnen
kann,
ist schon ein
großer
Gewinn.
Mit freundlichen Grüßen Ihr
ergebener
A. H.
Bucherer
ALS.
[6 193].
[1]See
Docs.
117
and
119
for
more on
Bucherer's work
on
Becquerel rays.
[2]Bucherer 1908b,
which
was
presented
22
September
at
the 80th
meeting
of the Gesell-
schaft Deutscher Naturforscher und Ärzte
in Cologne.
[3]Probably
Einstein
1906e.
[4]The argument
that follows
is
also contained in Bucherer
1909,
pp.
535-536.
[5]The
square
brackets
in
the
following equation
are
in
the
original
and denote the
vector
product.
[6]H.
A.
Lorentz;
see
Lorentz
1895,
pp.
24-26.
A copy
of
Lorentz
1906-a
reprint
of
Lorentz
1895-with
"Zangger"
written
in Zangger's
hand
at
the
top
of the title
page, is in
Einstein's
personal library.
[7]In
the
preceding
expression
v
is
the
speed
of
light.
[8]A
"Tensortripel" corresponds to
what
is
now
known
as a
three-dimensional
symmetric
tensor.
The
term
was
first introduced
by
Woldemar
Voigt
(see
Voigt
1898, §2).
[9]On
pp.
27-28 of
Lorentz 1895
the
problem
of
stresses
in
the
ether is discussed. Lorentz
calculates the Maxwell
stresses
on a
volume of free ether and shows that
in general
these
stresses do
not
vanish and should
set
the volume into motion. Since the ether
is
taken
to
be
immobile
as a
whole,
there
is
a
contradiction,
which
is
then cleared
away
by
the
assumption
that it
is
meaningless
to
speak
of forces that work
on
the
ether.
This
implies
that for the ether
the
principle
of action and reaction does
not
hold. For this conclusion Lorentz
was
criticized
by
Henri Poincare
(1854-1912) (see
Poincare
1900).
The introduction of the
concept
of elec-
tromagnetic
momentum
offered
a
way out
of
these difficulties. See Miller
1981,
sec.
1.7,
for
a
historical review.
[10]See
Planck
1908a, in
which Planck extends the
concept
of
momentum
beyond
mechan-
ics and
electrodynamics
by
arguing
that for
every
energy
flow
there exists
an
associated
mo-
mentum
which
is
found
by dividing
the
energy
flow
by c2.
A
momentum
flow is
also connected
with this
momentum.
[11]The
80th
meeting
of the Gesellschaft Deutscher Naturforscher und Ärzte
was
held from
20
until
26
September
in
Cologne.
[12]"Elektromag"
is
underscored
in red,
but
part
of the red line
(underneath
the letters
"ktro") is
deleted in
pencil.
[13]Cf.
Einstein's
comments
on
the
desirability
of
founding special relativity
on
basic ele-
ments
in
Doc.
73.
[14]See
Whittaker
1951,
pp.
293-303 for
a
review of theories of
vortex atoms.
[15]See
Poincare 1900 for Poincare's
hypothesis.
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