7 0 D O C U M E N T S 4 8 , 4 9 F E B R U A R Y 1 9 2 2
could be cured by means of a fifth dimension. While thinking about whether the
primary emission proceeds in a spherical wave, the following experiment occurred
to me now. Very obliquely incident cathode rays K produce on one of two parallel
plates of the same thickness, at A, planar
light. The plates generate interference with-
out phase differences—provided emission
proceeds in a spherical wave. Does a similar
experiment exist? A positive result is very
probable, however.
Warm regards, yours,
Einstein
48. To Hans Albert and Eduard Einstein
[Berlin, 12 February 1922]
My dear boys,
You are shrouded in mysterious silence again, you rascals. I am feeling well, but
there’s little news. The experiment on which I had placed so much importance
proves nothing for and nothing against the undulatory theory, so all the labors of
love were actually in
vain.[1]
Did you send the four photographs that were left over
from the 10 + 2 to my friend: Kuno Kocherthaler, 9 Lealtad, Madrid, d[ear] Albert?
If not, do it directly, but don’t forget. I still don’t have a sailboat but am on the
lookout.[2]
It simply has to be a very sturdy one, because everyone is so anxious
that my precious life not be put in danger. I’m very keen on spending our summer
vacation in my castle
(haha).[3]
Heartfelt greetings to all three of you from your
Papa.
D[ear] Albert, please go to the Zurich Kantonalbank and inquire there about why I
supposedly have 4,000 marks deposited there and then write me about it. I received
from there notification to that effect, which I cannot explain. Ask please when and
from whom the money was deposited there.
49. From Hans Albert Einstein
[Zurich, between 12 February and 4 March
1922][1]
Dear Papa,
I really haven’t written you for a very long time now; but there are two reasons
for it: First, I don’t have any news at all; and second, I’ve got quite a lot to do at
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