METALLURGY OF CAST IRON.
ere were forty-eight pig irons, embracing both y and Bessemer brands as well as softeners, dth coke and with charcoal, both cold and warm
Seven of the cast irons were of the shape seen kig. 67, being melted right from the tip. The 5 of the fifteen specimens were of the sand and ^_ .
>lls made by Mr. West in his recent experi-15 Two steels and nine alloys of chromium, jn, and manganese, with iron, complete the list nty-three specimens.
e melting was done in an assay furnace converted time into a cupola. Fig. 68 gives a front view lile in full operation. A jet of steam entering ik in the side near the top induced the blast, being drawn in all around the bottom. In this ; is really the * Herberz ' cupola of European nd excellent for small diameters. A hole was
into the wall just below the charging door, nust be kept closed when not used. This hole the introduction of the pieces of pig iron, etc. leaping up enough coke to last for some time, >ce of pig iron (of full section and about five long), was driven into the bed, surrounded by sscent coke, and the opening closed with a tile. .t was red hot the tile was removed, the pyrom-serted and pushed against the center of the tere the borings were taken for the analysis, uperature as registered by the pyrometer rose , then more slowly, remaining stationary while 11 melted slowly. Then as the point finally 5 uncovered the temperature jumped up, going
refers to the experiments seen on pages 332 to 339.rs, some of it being furnished by Mr. Jos. Seaman, Mr. Thos. D. West, and Mr. J. E. McDonald, members of this association, and the especially interesting alloys by Mr. R. McDonald, of the Crescent Steel Co.which runs back, parallel to the platinum wire, to the terminal box. Both wires are covereda short time, compared to that generally occupied in ordinary shop practice. The longer heated or semi-molten iron remains in contact with incandescent fuel or is exposed to gases, the more sulphur will be absorbed — up to the limit of the iron'sding its mate.. 2111 3Os i m. mi 3os 3OS. 3111. im ^os Jill l^S i in.