Canadian engineer . Veriico/ •ggcT/Qri-g have on these various causes of heat loss are examined andan attempt made to calculate probable losses the results areusually most unsatisfactory. On the other hand it is stillmore unsatisfactory to construct electric furnaces and findthat they are commercially impracticable because the heat loss through the walls is such a large percentage of thetotal heat generated in the furnace. The ideal method of studying the subject would be tomake the necessary experiments to determine the heat con-ductivity of the various materials to be used in constructingthe
Canadian engineer . Veriico/ •ggcT/Qri-g have on these various causes of heat loss are examined andan attempt made to calculate probable losses the results areusually most unsatisfactory. On the other hand it is stillmore unsatisfactory to construct electric furnaces and findthat they are commercially impracticable because the heat loss through the walls is such a large percentage of thetotal heat generated in the furnace. The ideal method of studying the subject would be tomake the necessary experiments to determine the heat con-ductivity of the various materials to be used in constructingthe walls of furnaces, to make measurements of the emis-sivity of the heated walls and so forth. But when the plansfor such an investigation are made it is soon seen that muchtime and expense is involved. Under these circumstances. * Read before the Am. Electro-Chem. Soc, April i8,1912. Note on an Unsuccessful Furnace Experiment, J. FitzGerald. Transactions 20, 89 (1911). Fig. 2. it was thought to be more immediately useful to determineby comparatively simple experiments what materials wouldgive the minimum loss of heat. By such work a great manymaterials could be immediately rejected and those whichgave good results would be more fully investigated. The apparatus used in the experiments is shown in The furnace is constructed of the bricks under investi-gation and is heated by means of a resistor of Nichromewire through which the current is passed. The resistor isconnected to the source of current through a rheostat sothat the rate of generation of energy in the resistor can beregulated, and means are provided for accurately measuringthis rate. The method of making a test is to regulate thecurrent so that a definite temperature is reached in the fur-nace and then to continue heating until the tempera
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