Their behaviour in this respect closely resembles the balls of rapidly cooled, unannealed glass which are called Prince Rupert's drops.
Using an unannealed Swedish iron wire, he found that when H was gradually diminished from 0.04 to 0.00004 C.G.S.
A, B, C, D, E Unannealed Cobalt (S) A, D, E Nickel-Steel (W)..
A, C, D, E Unannealed Cobalt.
The permeability of cobalt, both annealed and unannealed, was always diminished at the low temperature.
Experiments with the sample of unannealed iron failed to give satisfactory results, owing to the fact that no constant magnetic condition could be obtained.