Just like with cattle, white-hot hot metal is most often used to mark the skin in human branding.
But it is not very well adapted to large furnaces, and especially not to those cases where all the space round the furnace is required for manipulating heavy, white-hot masses of iron, or for similar purposes.
- Ferrous sulphide, FeS, results from the direct union of its elements, best by stirring molten sulphur with a white-hot iron rod, when the sulphide drops to the bottom of the crucible.
Wastes power and, still worse, time, heat, and metal, because the yellowor even white-hot piece is rapidly cooling down and oxidizing.
In addition to the above facts of polarization mention may be made of the partial polarization, in a plane perpendicular to that of emission, of the light emitted in an oblique direction from a white-hot solid, and of the polarization produced by diffraction.