✍ Scribed by B.V. Rollin; F. Simon
No coin nor oath required. For personal study only.
After a discussion of the experiments which have led to the idea that a film is formed on surfaces in contact with liquid helium II, further experiments on the anomalous evaporation from vessels containing liquid helium II are described. It is concluded from the experiments that liquid helium II "creeps out" o/the containers in the/orm o~ a/ilm and that this is responsible for the anomalous effects observed. § 1. In a previous paper 1) mention was made of the anomalous high evaporation from vessels containing liquid helium below the X-point and it was suggested that this was due to the existence of a /ilm o/liquid helium on the inside of the tube leading to the vessel. At that stage, without aiming at any detailed explanation, it was thought that the recently discovered anomalous heat conductivity of liquid helium II 2) might be responsible in some way or other for this phenomenon. Since then, further experiments have been carried out in order to obtain more definite information as to the nature of this effect. The experiments were interrupted at the end of 1936, as one of us left this laboratory, and for the same reason the publication has been delayed *). --We think it worth while to give a ratherd etailed review of our experiments, especially as they have enabled ua to form a picture Of what is happening, and this has successfully served as the guiding principle in some further work (see the following paper 8)). Moreover these phenomena have recently become of interest with *) The experiments and their interpretation were,however, described in various lectures, for the first time by one of us at the Langevin CoUoquinm in the Coll~ge de France in December 1936.
--219 --*) D was the expansion chamber of a helium liquefier which after the expansion remained filled with liquid helium. Then a slight overpressure was applied to the tube PQR; the gas coadensed in the region of Q and the liquid dropped down to C.
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