. Canadian foundryman (1918). ly whenthe door or other opening islarge in relation to the furnaceand is opened frequently, largedifferences may exist betweendifferent parts of the furnace. (c) Unless the material whichis under treatment is left in thefurnace or bath a sufficient timeit will not attain the temperatureof the furnace, and thereforemay be at a much lower temper-ature than that measured by theinserted pprometer. These conditions and limita-tions apply with equal force toother types of pyrometer thanthe thermo-couple—in fact, in thecase of the electric resistance orexpansion instrum
. Canadian foundryman (1918). ly whenthe door or other opening islarge in relation to the furnaceand is opened frequently, largedifferences may exist betweendifferent parts of the furnace. (c) Unless the material whichis under treatment is left in thefurnace or bath a sufficient timeit will not attain the temperatureof the furnace, and thereforemay be at a much lower temper-ature than that measured by theinserted pprometer. These conditions and limita-tions apply with equal force toother types of pyrometer thanthe thermo-couple—in fact, in thecase of the electric resistance orexpansion instruments the largerbulk of the sensitive portion mayaggravate the resulting errors. Suitability of Contact Pyrometers From the foregoing considerations itwill be clear that the contact or insert-ed pyrometer is suitable for those casesin which the material under treatment re-mains in a closed furnace or in a bath fora time sufficient to ensure reasonableequality of temperature, and to cases in 180 CANADIAN FOUNDRYMAN Volume
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