It is formed in water, and not from the cementing and regelation of the powdery crystalline snow, as is glacier ice.
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.
Both Professor Helmholtz and I have since agreed to consider the physical cause of regelation an open question.
This latter question is not once referred to in the memoir in which the regelation theory was first developed.
But a little further down the wound is healed again, and regelation has restored the smooth surface of the glacier.
In fact, regelation will confer upon it all the appearance of viscosity.
This “regelation” is due to the increased pressure at the various points of contact causing the ice there to melt and cool.