from
The Collaborative International Dictionary of English v.0.48
Mitis casting \Mi"tis cast`ing\ [Perh. fr. L. mitis mild.]
A process, invented by P. Ostberg, for producing malleable
iron castings by melting wrought iron, to which from 0.05 to
0.1 per cent of aluminum is added to lower the melting point,
usually in a petroleum furnace, keeping the molten metal at
the bubbling point until it becomes quiet, and then pouring
the molten metal into a mold lined with a special mixture
consisting essentially of molasses and ground burnt fire
clay; also, a casting made by this process; -- called also
{wrought-iron casting}.
[Webster 1913 Suppl.]