72
DOCS. 99-101
MAY 1908
thus,
all
of the
pieces
of
wood rest
on a
steel
band,
which
may
be covered with
leather,
for
example.
I have
calculated
such
a thing
for
2
revolutions
with
2
cm
of
spring
action
(without
jolts)
it works
quite
well.
You
see,
the
jolt is
transmitted
only
to
a
body
with
very
small
mass,
similarly
as
with
pneu.
The
thing
would be
very inexpensive,
and
the
repair
would
cost
about
5
fr. if all
the
pieces
of wood went
kaput.
The
thing may
perhaps
work out
for
railways
too,
one
would
then
no
longer
have
the
annoying jolts
from
the
joints
in the
rails.
Cordial
greetings
from
your
P
H.
Greetings
to
Dr.
Laub
too.[6]
I
read
your paper
with
great pleasure,
and
even
if the
integration
business
(at
least
this
one) is
way
over my
head,
I
got a good
picture
of
all
the
things, especially
since
you
already
told
me a
lot
about
them.
100.
From
Aurel
Stodola[1]
[Zurich]
17
May
1908
Highly
esteemed
Mr.
Einstein:
Sincerest thanks for
sending
me
your
papers. I
very
much liked
your popular
presentation
of the Brownian
phenomenon.[2]
I
am
reading
the
rest without, in
fact,
being
able
to
comprehend
it
completely,
but
with
great
interest
nonetheless. Cordial
greetings
from
yours truly,
101.
From
Jakob
Laub
Würzburg, Weingartenstr. 18,
18
May
1908
Dear
friend,
First of
all,
let
me
thank
you again
for the
lovely
time
I
had
at
your
house.
Now
I
am
in
Würzburg
again,
and
remember
with
pleasure
the
delightful
discussions in
Bern.[1]
There
are so many things
that
I have
had
to discuss with Prof. Wien
that
I
have
not
yet come
to
the
"signals."-[2]
As
far
as our
second
paper
is
concerned,[3]
Wien
pointed
out
to
me
that Lorentz
gave
the
ponderomotive
forces for
nonmagnetizable
bodies
(but
g
5^ 1)
in
the
Enzykl.[4]
Lorentz
seems
likely
to
have
noticed that
it's not such
easy going
with
magnetized
bodies.
I
cited Lorentz
in
a
note.-[5] For
Wien insisted
on
bibliographi-
cal
references.
So
I
made
him
happy
and also cited
Abraham,[6]
that
he
too
assumes[g
95]
for
magnetized
bodies
in his
textbook.[7]
I
also
spoke
with Wien
about
the
experiment
with
ultraviolet
light.
In
the
next
few
days
we
will discuss it in
greater detail; I hope
that
it will work.
I
will
then
give you
a
detailed
report
about
everything.