Materia photographica : a treatise on the manufacture, properties, and uses of the substances employed in photography (1891)
Leaper, Clement J · London : Iliffe · leaf 112
100 MATERIA PHOTOGRAPHICA. metallic iron so produced unites with a portion of the carbon of the coal to form cast iron, a variety of iron containing about 5°/^ of carbon, silicon, and other matters. The cast iron so formed … gradually sinks, and having been melted by the intense heat nearest the twyers is tapped off from time to time and cast into bars or pigs. To produce wrought iron (a purer variety of the metal, distin- guished from cast iron by its malleability and comparative infusibility), the cast iron is melted…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
