2 2 V O L . 7 , D O C . 6 5 a ; D O C U M E N T 1
(taken at the temperature of the compressor).
If there is also cooling between compressor and exchanger, then the total cold
developed by the exchanger and evaporator is raised by an amount equal to the
removed heat . The degree of efficiency thereby rises by .
A more accurate theory must take into account the thermal conduction of the
exchanger, as a completely insulated nonconducting exchanger could not have a
stationary temperature distribution.
Comment: A lower limit for the attainable refrigeration is given in that at the
lowest temperature (evaporator) cannot become negative.
Vol. 7, 65a. Expert Opinion on Proposal by
Berlin, 12 October 1921
I know about the suggestions by Dr. Heinrich Löwy, Vienna, regarding ground
depth analysis through the influence of the ground’s interior on an external oscil-
lating electric circuit. In my view this proposal deserves serious examination
from the technical angle. From the standpoint of the theory it may be stated that Dr.
Löwy’s method rests on solid theoretical bases and that the anticipated effects do
lie thoroughly within the range of modern measurement precision.
1. To Charlotte Weigert
Dear Miss Weigert!
Elsa has been pestering me dreadfully about giving you a recommendation to
Niels Bohr. But I had to resist, I’m sorry. Bohr is the greatest genius in physics
today, enormously busy and mentally exhausted for a long while. Now he is
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