Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . n are subjected, in con-tact with solid carbon for a certain time, to a unilbrmred heat, the access of other oxygen during the processbeing prevented. By this means the oxygen leavesthe iron ami unites with the carbon, (lassing off ina gaseous state, while the iron renuiins, being re-duced to a metallic state as iron sponge. The me-tallic iron thus obtained is,
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . n are subjected, in con-tact with solid carbon for a certain time, to a unilbrmred heat, the access of other oxygen during the processbeing prevented. By this means the oxygen leavesthe iron ami unites with the carbon, (lassing off ina gaseous state, while the iron renuiins, being re-duced to a metallic state as iron sponge. The me-tallic iron thus obtained is, however, in a very .sensi-tive condition while hot, and in that state absorbsoxygen with great avidity ; but, if cooled before be-ing brought into contact with the atmosphere, itdoes not readily re-oxidize. After reduction, the iron sponge retains the shapeof the ore from which it is derived, liut somewhatexjianded in bulk, and with very marked loss ofweight. It has a s]iongy texture ; is readily .sectile ;is easily indented by the linger-nail ; chews like leadbetween the teeth, and polishes iiuickly to a silveryluster. Its color, uidess influenced by some color-ing matter accidentally present in the ore, is grayish, Fig. ^.; R M^SSK-
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
