558 



CANDLE-POWER OF ARC LAMPS 



[Cn. XIII 



762. Rectifier; Electrodes at right angles. 



763. Power in kilowatts drawn from the line for different 

 values of light. Inclined electrodes, 110-volt supply, transformer 

 96 per cent efficiency. 



764. Light given for different values of kilowatt con- 

 sumption. 



Kilowatts 



Candle-Power 



765. Candle-power measurements with direct current sup- 

 plied by a mercury arc rectifier. By using a mercury arc rectifier 

 to convert alternating current to direct current, very nearly the 

 same light intensity is obtained as if the same amperage of direct 



