96 DOC.
82 MAY 1915
The business
regarding
the
sign
is
definite
after
all;
I
have
submitted
a
small
correction.[4]
The
correct
diagram
now
looks
like
this:
rotation
moment of
the
effect
lamp
current
angular
range
for
a
field
fiber
oscillation
An
angle deviating only slightly
from
n
between the fiber oscillation
and the
swing
a
is possible only through
the
selected rotation
momentum
sign.
The
angular
constraint
must be introduced because
the
phase
angle changes very
abruptly
near
the
resonance.
Our earlier conversation dealt
with the
oscillation
of
the
loose incandescent
lamp
filament. There the
swing phase
is
opposite
to
that
of
the
force
according
to
the
adequately precise
valid
formula
force
=
mass
.
d2/dt2
(swing).
An
addition
to
our
experiment
of
the
one suggested
by you
remains desirable
in
any
case.
I
wish
you
the
best of
success.
Do
write
to
me
occasionally
about
how it
is getting
on.[5]
I wish
you
both
a
happy
life
in
rural
serenity;[6]
I
regret very
much
that
my
like-
minded friends
are
no
longer
here.
I
gratefully
appreciated
the little
compliment
on
the
lecture,
likewise
the
friendly consignment
of sweets.
With heartfelt
greetings
to
you
and
your
little
ones.
My
best
regards
to
the
estimable innocent
instigator
of
my
ineptitude.[7]
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