1866 C. N. Emerson 104 On Steel made directly from muck-bar, blooms, slabs, or loops a tax of three dollars per ton.
1894 Feb. 421/3 The ‘muck-bar’ is broken up, bunched together, raised to a welding heat, and again and again carried through the rolls.
1914 22 34 (table) Muck bars, bar iron, etc.