DOCS.
15,
16
JUNE
1914 27
But far be if from
me
to demand
or
expect
this. In
a
letter
to Planck[3] I
said
that
I
completely
understand
if
the Berlin
physicists
want
to
preserve
their
main influence
on
the
society,
and
that
is
why
I have
suggested founding
a
second
society
which
is
closely
associated to
the
Berlin
society
but
which has
the
sole
task
of
organizing
the
conferences of German
physicists.[4]
Such
an
outcome has
disadvantages
over
a
single
German
physical society;
but
surely
it
is
preferable
to
a
division
among
German
physicists,
and
this
we
certainly
must avoid under all circumstances.
I
would
actually
have
preferred
to
discuss scientific
problems
with
you.
I
have
not
yet quite
penetrated
the
secrets
of gravitation
theory.
With best
regards!
16. From Walter
Schottky[1]
Steglitz,
12a Fichte
St.,
25
June
1914
Highly
esteemed
Professor,
I
have
jotted
down for
you
on
the
enclosed
slip
the
differential
equations
for
the
space charge
potential
affected
by
an
axial
magnetic
field
so
that
you
can see
how troublesome
they
are.[2]
In
this
form,
in
any
case, [they
are]
still
more
of
a
“necessity”
than
a
“virtue.”
With
best
regards,
I
am
very sincerely yours,
Walter
Schottky.
1)
d/dt(rdV/dr) =
2J/u
(Poisson's
eq.)
2)
u2+v2
=
2yV
(Energy
eq.)
3)
C=V/u=rdo/dr.
4)
Radius of curvature
=
1+c2
J
current
per
cm
filament
(u,
v)
velocity
r
=
E/u,
V potential.
Difference
against
the
filaments
H
magn.
field
strength
(Magn. deflection)
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