Comparative tests of carbon, metallized carbon and tantalum filament lamps . 1 28 ILLINOIS ENGINEERING EXPERIMENT STATION The metallized lamp changes no more in efficiency than itdoes in candle power. The carbon lamp changes rapidly, becom-ing less and less efficient with respect to the metallized tantalum lamp becomes relatively more and more efficientthan the metallized lamp during the first 250 hours and then tends 1 [. 000;0-t<MOOO^-tI^OCO?D-*MOOO?D+iMOOOO-*-(r-l Candle Power AMRINE—COMPARATIVE TESTS OF LAMPS 29 to drop off and approach it in efficiency. When operating unde
Comparative tests of carbon, metallized carbon and tantalum filament lamps . 1 28 ILLINOIS ENGINEERING EXPERIMENT STATION The metallized lamp changes no more in efficiency than itdoes in candle power. The carbon lamp changes rapidly, becom-ing less and less efficient with respect to the metallized tantalum lamp becomes relatively more and more efficientthan the metallized lamp during the first 250 hours and then tends 1 [. 000;0-t<MOOO^-tI^OCO?D-*MOOO?D+iMOOOO-*-(r-l Candle Power AMRINE—COMPARATIVE TESTS OF LAMPS 29 to drop off and approach it in efficiency. When operating undercondition B the changes in candle power and efficiency are muchthe same except that the changes occur more rapidly. It is no-ticeable that in this case the carbon lamp starts out with the high-est candle power, but after 500 hours of burning it has the decrease in efficiency is correspondingly rapid. Under con-dition B the tantalum lamp no longer becomes less efficient rela-tively to the metallized lamp as the period of burning increasesas it does under condition A. Its efficiency curve tends to fallfurther and further below that of the metallized lamp. The reason why the tantalum and metallized filament lampsshow a better efficiency than the carbon is of considerable inter-est. There is no doubt that the greater amount of the superiorefficiency of the newer t
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