Abstract
The thickness (
d
) of the helium II film and its variation with height (
H
) and temperature were measured by a dynamic method involving the oscillations of a meniscus in a capillary. The variation with height could be represented only approximately by the equation
d
=
k/H
n
, as the effective value of
n
was greater at smaller values of
H
. The mean value of
n
over a range of heights from 0·5 to 5 cm. was 0·14, which is appreciably smaller than the values predicted by the theories so far advanced to explain the formation of the film. The order of magnitude of
k
was 2 x 10
-6
cm., but it varied slightly with the nature of the surface or some other experimental factor.
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