. Thermostatic control of electric heating appliances . . Temp,620°?. 4850 ^ Variation a ^^^J^^ s ^. 5S0 Second Run. Break Make. 9*Q 9»9^ Ave 500°F. 5J venation - ^i^Jg^ -^ • Third Kun. Break. Make. 515°P. % Variation « ^^62^^^ « ^^^ 25. The thermo-couple was calibrated hy plac-ing one end into an oil bath and the other into iceBhavingB* The calibration cxirve for this particu-lar couple is shown in A oentemeter eample of the invar us
. Thermostatic control of electric heating appliances . . Temp,620°?. 4850 ^ Variation a ^^^J^^ s ^. 5S0 Second Run. Break Make. 9*Q 9»9^ Ave 500°F. 5J venation - ^i^Jg^ -^ • Third Kun. Break. Make. 515°P. % Variation « ^^62^^^ « ^^^ 25. The thermo-couple was calibrated hy plac-ing one end into an oil bath and the other into iceBhavingB* The calibration cxirve for this particu-lar couple is shown in A oentemeter eample of the invar used for the braBB-invar etrip wae placed into a waterbath and the expansion measured for a variation intemperature of about 80 C« Three runs were made andfrom the results obtained the coefficient of expansionwas found to be about 0,000,000,536. The readings obtained were as follows. o Range of Temperature C. Elongation of Sample. 80 .OOllSO cm. 80 .001190 80 .001145 Ave. 80° ,001156 Ave. coefficient of Expansion e6 ^1 ^0*000,000,6S5. Fig. Curve of Thermo-couple. 25B, CALIBRATIOH OP THERMO-COUPLE, TEMPgRATURE MILLI-VOLTSUEFLECTIOU. 250 300 360 400 450 500 550 APPENDIX. 26. BIBLIOGRAPHYOPRETEEMCES COWSULTED. Electric heating and electric heater control* , Jr. American Society of Heatingand Ventilating 1914. Howard electric heat regulator. Domestic Engineering ,1915. Underwriters approve thermostat control. Electric Hallway Journal ,1916. Electrically heated high school at Burley, Idaho. P, E. Ware. Electrical World , 1916. Train heating. General Electric Review ©-5 Electric high school at Rupert, Idaho. Heating and Ventilating Magazine Electric heating. G. Wilkinson. Institution of Electrical Engineers. Journal. V,54 , p.£15-222 65
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