A short description is given of an expansion liquefier which yields a supply of liquid helium in a Dewar vessel and is very economical in liquid hydrogen.
REFERENCES
1.
F.
Simon
, Actes du VIIe Congrès International du Froid, The Hague
, 1
, 367
(1936
), where also earlier references are given.2.
See for instance:
F.
Simon
and J. E.
Ahlberg
, Zeits. f. Physik
81
, 816
(1933
);3.
4.
5.
J. E.
Ahlberg
, J.
Estermann
, and W. O.
Lundberg
, Rev. Sci. Inst.
8
, 422
(1937
).
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© 1939 American Institute of Physics.
1939
American Institute of Physics
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