1 8 0 D O C U M E N T S 2 8 7 , 2 9 0 N O V E M B E R 1 9 2 1
287. From Max Planck
Grunewald, 2 November 1921
Dear Colleague,
With your postcard from
Zurich,[1]
in which you allowed me to understand your
point of view, you made me so very happy and at the same time indebted me last-
ingly and deeply. I cannot express it to you now as I would like, so please make do
with these lines. We shall anyway soon be speaking to each other in person, I hope,
also about satisfactory impressions from your journey.
Yours truly,
M. Planck.
288. To Ilse and Margot Einstein
[Leyden,] 5 November
1921[1]
[Not selected for translation.]
289. From Hans Geiger
Charlottenburg, 25 March Street, 7 November 1921
[Not selected for translation.]
290. From Max Schuler
Neumühlen near Kiel, 7 November 1921
Esteemed Professor,
Dr. Anschütz-Kaempfe informed me from Munich that you had corresponded
with him again about the magnetic
experiment.[1]
Unfortunately I had no time during your stay in
Kiel[2]
to talk with you about
this matter, and it could not be made properly clear to me from the few explanations
made by Dr. Anschütz. You seem to prefer static measurement, after all, by means
of a magnetic needle; I cannot quite picture how you imagine the matter without
the emergence of back action effects of the rotating metal cylinder on the magnetic
needle caused by eddy
currents.[3]
On the contrary, I believe that the induction method is much more accurate be-
cause I, in any case, cannot see any source of disturbance. I imagine the arrange-
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