a process of steelmaking in which the charge is laid in a furnace (open-hearth furnace) on a shallow hearth and heated directly by burning gas as well as radiatively by the furnace walls.
[ 1885-90 ]
OPEN-HEARTH PROCESS
Meaning of OPEN-HEARTH PROCESS in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012