open-hearth

[ oh-puh n-hahrth ]

/ ˈoʊ pənˈhɑrθ /

noting, pertaining to, or produced by the open-hearth process.

Origin of open-hearth

First recorded in 1880–85

Open-hearth steel is an important manufacture in Birmingham.

Commercial Geography |Jacques W. Redway
I looked over at the eight stacks of the open-hearth, closed my eyes, and saw Seven tapping.

Steel |Charles Rumford Walker
Of the fifty-six open-hearth and other steel furnaces contemplated in the original plan, forty-seven have been completed so far.

United States Steel |Arundel Cotter
They may be either Bessemer, open-hearth, or crucible steel.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 7 |Various

I entered the open-hearth mill by the tracks that ran close to the furnaces.

Steel |Charles Rumford Walker