128
EINSTEIN ON THE
STATIC FIELD
While Einstein
1912e
(Doc. 7)
shows
the
physical reasoning
that
guided
Einstein's
attempts
to
go beyond
the
static
theory,
it
does
not
contain
any
hints of methods
more
advanced
than those used in
his
earlier
papers.
Such
hints
can
be
found
in
a
note
added
in
proof
to Einstein 1912d
(Doc. 4).
In
this note
Einstein reformulates his
static
theory
in
terms
of
a
Hamiltonian
formalism,
analogous
to
what Planck had done for
special
relativity.
He
concluded: "The Hamiltonian
equation
written above hints
at
the struc-
ture
of
the
equations
of motion of
the
mass
point in the
dynamic gravitational
field."[47]
[47]"Die
zuletzt
hingeschriebene
Hamiltonsche
Gleichung
läßt
ahnen, wie die
Bewegungs-
gleichungen
des
materiellen Punktes
im
dynamischen
Gravitationsfelde
gebaut
sind"
(Einstein
1912d
[Doc.
4],
p.
458).
For further
discussion,
see
the
editorial
note,
"Einstein's Research
Notes
on a
Generalized
Theory
of
Relativity,"
pp.
193-194.