But the case is different with regard to the cause of regelation itself.
Faraday, who discovered this phenomenon, named it the regelation of ice.
Two such rings soldered by regelation at a are shown in fig. 14.
I question, however, the statement, that regelation takes place by the freezing of a film of water between the fragments.
It was moist and soft, in fact in a condition altogether favourable for the "regelation" of its granules.
It is this same principle of regelation which enables men to cross snow bridges in safety.
This latter question is not once referred to in the memoir in which the regelation theory was first developed.
On both theories, therefore, the strength and quickness of the regelation ought to correspond to the magnitude of the pressure.
Both Professor Helmholtz and I have since agreed to consider the physical cause of regelation an open question.
But a little further down the wound is healed again, and regelation has restored the smooth surface of the glacier.