D O C U M E N T 3 1 J A N U A R Y 1 9 2 2 5 7
8.) From this theorem by Gibbs therefore follows: No matter how long and far
we run along with the group, we always see in it solely the waves with the small
inclinations between , which correspond to one the slit breadth (or a part of
it)—just the fictitious (dead!) waves far in advance of the head of the group have
the large inclinations.
31. To Paul Ehrenfest
[Berlin, between 19 and 22 January
1922][1]
Dear Ehrenfest,
Everyone is pelting me about my constant doggedness. Laue already had a
proper duel with me at the
colloquium.[2]
But I’m sure of my point. I performed a
fine, rigorous calculation that will surely convince you. It’s just too long for me to
be able to tell you the essence so briefly. In a couple of weeks I’ll send you the cor-
rection
proofs.[3]
The error in your
consideration[4]
lies in the following:
You prove that a wave that enters at A after propagating has
the same inclination for the wave normal at B as at A. This
would be true—if the wave complex arrived at B. This, how-
ever, is not what it does; instead it arrives at C and its wave
normal at C has the orientation AC.The whole problem can
only be solved properly if one examines the course of the ray.
I started from a strict solution and consider my proof secure—
whatever a theoretical physicist may call secure. I am peni-
tently remorseful of formerly committed blunders . . . . In any
event I am curious what you’ll say about my proof. My love
for it is naturally based for the most part on my having agonized over it. The Span-
ish fellow scientist interested in the Au-ion affair is called Kuno Kocherthaler,
Apartment 425, Madrid, 9 Lealtad Street. I laughed myself to tears about your mes-
sage regarding
him.[5]
With Grommer I am trying to address the zero-point energy
problem.[6]
It’s not easy. I also have in mind to determine with Geiger and Bothe
the quadratic Doppler effect by means of a few little tricks; but it is
difficult.[7]
Prod
K[amerlingh] Onnes about the superconductivity
experiments.[8]
Did the young
American find fluctuations? I ought to have gone to Paris for New Year’s, but could
not overcome my weariness of
traveling.[9]
Kramers recently visited me, an excel-
lent
fellow.[10]
Are you still thinking about the spectral
congress?[11]
It really would
be fine if Julius were to analyze the solar-center/solar-limb effect photographically/
photometrically by then, so that some clarity could be reached on
this.[12]
The main
ε±
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