Tests of Glow-Lamps. 



393 



Fig. 1. — Tests of American and European Lamps. 



200 400 600 800 



Time in Hours. 



Curves marked Initial Watts per Candle. 



I From 2-0 to 2-5 



II From 2-5 to 3'0 



III From 3-0 to 35 



IV From 35 to 4'0 



V. Over 4. 



1000 



1200 



Fur. 2. 



600 

 Time in Hours. 



1200 



