Comparative tests of carbon, metallized carbon and tantalum filament lamps . ge and above, it hasthe greatest candle power. The tantalum filament takes the high-est position at the 80-volt point and increases more gradually un-til at normal voltage and above, it has the lowest candle metallized filament curve takes an intermediate position. Theequations for these curves obtained by the method of least squaresfrom the experimental data are: For the carbon lamp CP = X 10 X For the metallized lamp CP = X 10 X E^-^For the tantalum lamp CP = X 10 X E- AMRINE—COMPARATIVE T
Comparative tests of carbon, metallized carbon and tantalum filament lamps . ge and above, it hasthe greatest candle power. The tantalum filament takes the high-est position at the 80-volt point and increases more gradually un-til at normal voltage and above, it has the lowest candle metallized filament curve takes an intermediate position. Theequations for these curves obtained by the method of least squaresfrom the experimental data are: For the carbon lamp CP = X 10 X For the metallized lamp CP = X 10 X E^-^For the tantalum lamp CP = X 10 X E- AMRINE—COMPARATIVE TESTS OF LAMPS 7 Below is shown a table exhibiting the change in candle power foran increase of 5 per cent in the voltage and for a decrease of 5 percent in voltage from the normal. TABLE 2 Lamp C. P. Increase for Five percent Increase in Voltageabove Normal C. P. Decrease for Five percent Decrease in Voltagebelow Normal Carbon or per cent or per cent Metallized or per cent or per cent Tantalum or per cent or per cent. 80 85 90 95 100 105 110 115 120 125 130 135 140 145Volts Fig. 4 Characteristic Curves of Candle Power and Watts PER Candle J 8 ILLINOIS ENGINEERING EXPERIMENT STATION The change in efficiency or watts per candle is also shown inFig. 4, indicating a wide difference in favor of the tantalum lampthroughout the range of voltage. The curves showing thechange of resistance with the voltage (Fig. 5) indicate that the 320 300280260 a 240o 220 2 200 180160140120 T -7- TANTALUM- METALLIZED: CARBON- 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160Volts Fig. 5 Curves Showing Change of Resistance With Voltage tantalum and the metallized filaments tend to regulate for con-stant current. In these filaments the resistance rises with thevoltage. Hence in a poorly regulated circuit, when there is anincrease in pressure, the resistance of the filament becomes great-er on account of the increase in temperature. This preven
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