the Week of Christ the King / Proper 29 / Ordinary 34
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A fusible white cast iron containing a large amount of carbon (from three and a half to six per cent) and some manganese. When the manganese reaches twenty-five per cent and upwards it has a granular structure, and constitutes the alloy ferro manganese, largely used in the manufacture of Bessemer steel. Called also specular pig iron, spiegel, and spiegeleisen.
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Webster, Noah. Entry for 'Spiegel Iron'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/spiegel-iron.html. 1828.