Compton, Alfred G. (Alfred George), 1835-1913 · New York : J. Wiley & Sons · leaf 76
62 FIRST LESSONS IJST METAL- WORKING. to the bottom, and is drawn off from time to time, tlirougli an opening made for the purpose, as cast-iron. The lighter one floats above this, and is drawn off through another opening, as ^^slag" or cinder." When cold, it is usually, though not alw^ays, broken… … Fig. 49. CO. One of the groups composed of B and C is called a sow and pigs," and the pieces each of which is about three feet long and contains about 100 lbs. of iron, is called a "pig." The " pig-iron" thus produced contains various impurities, according to the kinds of ore, lime, and fuel used.…
Metal-work
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
