. The Bell System technical journal . ensity to melt a 100-gram sample in about two minutes isapplied to the bottom of the crucible. The bottom edge of the samplemelts first and the balance of the sample shdes smoothly into the pool ofmetal first formed with a minimum of rupture of the surface. The broadround shape of the crucible permits it to be tilted until the lip is but a frac-tion of an inch from the surface of the mold before the metal starts to pour,thus subjecting the stream of molten alloy to only a brief exposureto the atmosphere during pouring. The molten alloy should never bestirr
. The Bell System technical journal . ensity to melt a 100-gram sample in about two minutes isapplied to the bottom of the crucible. The bottom edge of the samplemelts first and the balance of the sample shdes smoothly into the pool ofmetal first formed with a minimum of rupture of the surface. The broadround shape of the crucible permits it to be tilted until the lip is but a frac-tion of an inch from the surface of the mold before the metal starts to pour,thus subjecting the stream of molten alloy to only a brief exposureto the atmosphere during pouring. The molten alloy should never bestirred nor should the crucible be shaken unnecessarily during the castingoperation. Under the melting conditions described, the casting tempera-ture of the melt is controlled sufficiently if the crucible is removed from theflame three or four seconds after the last portion of the sample has slight modifications in technique, samples for analysis may be takendirectly from the commercial melting kettles. The mold used is probably.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
