REFERENCES
1.
Code 7930 porous glass, Corning Glass Works, Corning, N.Y.
2.
A dilution refrigerator in which is diluted with liquid supplied through a superleak has been operated at the Kamerlingh Onnes Laboratory and we are grateful to Dr. R. de Bruyn Ouboter for details of this device. The principle of the method was originally suggested by H. London.
3.
D. F.
Brewer
, D. C.
Champeney
, and K.
Mendelssohn
, Cryogenics
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(1960
).4.
K. R.
Atkins
, H.
Seki
, and E. U.
Condon
, Phys. Rev.
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, 582
(1956
).5.
Emerson and Cuming, Inc., Canton Mass.
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© 1968 The American Institute of Physics.
1968
The American Institute of Physics
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