DOCS.
587,
588
JULY
1918 611
we on our
part just
have
the
comment
re
the
diagram
under “C”
(page
5)
of
the
attached
typed
copy
that the
opponent[2]
is
expected
to
point
to
the
omission in
the
directive force of
the
oscillation-impeding gyroscope.
For
depending
on
this
gyroscope’s
size
and
revolving speed,
the
line
a-a
will
not coincide
exactly
with
the
meridian
but
will
include
a specific,
although
invariable and
easily
ascertain-
able
angle,
because
this
gyroscope’s
directive force also
is
transmitted
to
the
float
k
via
the
spring
tied to it.
(If
this
one
oscillation-impeding gyroscope
is
replaced by 2
of
equal
size
but
re-
volving
in
opposite directions,
this deviation
disappears,
which
case
corresponds,
by
the
way,
to
the
diagram
of
figure
4 of
our
Patent
Specification
241
637.)
In
other
words,
with
both
gyroscope
axes
forming
an
angle
with
the
meridian,
your
diagram
thus
again
resembles
the
design example
of
our
patent
specification,
the
more so
since it
suffices
for
only one gyroscope
to be
equipped
with
a
yielding
link
with the
float.
Since
it
does not bear
well
to
go
into the
details of these
relations,
it would
perhaps
be advisable
to
change
the
end of Section
C
a
little.[3]
We
reserve
for ourselves
to
convey our
patent
attorney’s opinion
on
this
to
you
as
well,
and remain in
the
meantime,
in utmost
respect, your
devoted
servants,
Anschütz
&
Co.
588. From Felix Klein
Göttingen, 15 July 1918
Esteemed
Colleague,
I have succeeded
in
discovering
the
organic
formation law for Hilbert’s
energy
vector.[1]
If
the
infinitesimal transformations
of
my January note[2]
are
not
spe-
cialized to vanish at
the
edge
of
the
integration
domain,
one
obtains,
in
addition
to
the 4-fold
integral (which
must vanish for
arbitrary
pa),
another
triple integral
taken
along
the
edge
(which,
independent
of
the
edge’s
shape,
must
correspond-
ingly
be
zero):[3]
JJJyM*
dw2dw3dw4 +
.
e4
•
dw1dw2dw3}.
And here
now
is
e1...e4,
subject
to
changes
one
might
want to
attach
owing
to
the
field
equations, or
even
the
addition
of
a
simple
tensor,
whose
divergence
vanishes
identically,
the
sought
vector.-[4]
I
hope very
much to
pave
the
way
from