1 2 4 D O C . 1 4 6 O C T O B E R 1 9 1 9
.
You may possibly find this quite interesting.
Yesterday I heard from Harms that Zeeman in Amsterdam just now published a
new experiment on the optics of moving bodies, in which the light propagates in a
glass or quartz object instead of in water, as in Fizeau’s experiment.[5] This is one
more reason to straighten out Harress’s experiment now as well.
With cordial regards, also to Planck, yours,
M. Laue.
Recipient’s notes on verso:
,
“1. Ionization work in metals
?=
lattice work.
“2. Neutral separation work
?=
work for loosening an electron from the [io]n.
“From (1), lattice work independent of the remainder.
“[From] (2), neutral separation work indep. of metal.”
146. From Hans Thirring
Vienna, 20 October 1919
Dear Mr. Einstein,
A moment ago I read in the Naturwissenschaften your little notice about the shift
in fixed-star
positions.[1]
Ever since I understood gravitation theory, I never doub-
ted the existence of this effect; I was nonetheless mightily pleased about its discov-
ery and congratulate you most heartily on it.
If I had the effusive style of a d’Annunzio, I would now cry out: This day marks
you as the greatest physicist in the
world![2]
In July I was in Berlin again for a week—unfortunately just at a time when you
were not
there.[3]
Did you receive (about 8 months ago) the 10 separate offprints of
my little lecture on gravitation
theory?[4]
I am presently engaged in some not uninteresting speculations about atomic and
crystalline structure—a preliminary report about that will be going out to the Phys.
Zeitschr. in the next day or
so.[5]
For it can be very strictly proved on the basis of
the Sohnke-Schoenfliess theory that it is impossible to arrange axisymmetric atoms
in a Bragg diamond lattice so that the symmetry class that had been experimentally
found macroscopically for diamond comes
out.[6]
It can be shown analogously that
with such axisymmetric atoms a structure with a regular holohedral symmetry
(NaCl) can be built on the basis of Bragg’s NaCl lattice but not with the enantio-
t′ t
vx⎞
c2
-----⎠


: 1
v:c)2
( =
Na[+] Cl[-] Na+ Cl NaCl Na Cl
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