. Transactions. i*<^-^... Fig. 1.—Electrolytic Iiojn MeltedIN AN Atmosphere op CO Gas underAtmospheric Pressure (Compare withFig. 11). Magnification 40 Diam-eters. Etched with Picric Acid. Fig. 2.—Top Surface of an Ingot opPure Iron, Melted in Vacuo. This method of melting took care of the contamination (see ), and the iron, after being permitted to cool in the furnace, wasperfectly bright when removed (Fig. 2). In magnetic quality, too, itrose far above anything known at that time.^ The maximum permea-bility for this pure vacuum iron was found to be 19,000 as comparedwith 6,000 to 8,
. Transactions. i*<^-^... Fig. 1.—Electrolytic Iiojn MeltedIN AN Atmosphere op CO Gas underAtmospheric Pressure (Compare withFig. 11). Magnification 40 Diam-eters. Etched with Picric Acid. Fig. 2.—Top Surface of an Ingot opPure Iron, Melted in Vacuo. This method of melting took care of the contamination (see ), and the iron, after being permitted to cool in the furnace, wasperfectly bright when removed (Fig. 2). In magnetic quality, too, itrose far above anything known at that time.^ The maximum permea-bility for this pure vacuum iron was found to be 19,000 as comparedwith 6,000 to 8,000 for the best commercial iron used at the presenttime. The hysteresis loss, too, was found to be much lower than forordinary iron. An iron with very promising characteristics was thusproduced. If the electrical resistance of this iron, which in the purestate is very low, could be increased without impairing its magneticproperties, an ideal iron for electromagnetic purposes would be produced. In experimenting further w
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
