Tests of Glow- Lamps. 407 



Fig. 10 a.— Preliminary Tests on Edison-Swan 8 C.P. 100-volt 

 Lamps run at Various Voltages. 



Group of 3 Lamps 

 marked 100-8 run 

 at 100 volts. 



Group of 3 Lamps 

 marked 100-8 run 

 at 102 volts. 



Group of 3 Lamps 

 marked 100-8 run 

 at 104 volis. 



Full lines represent Candle-Power and Time. 

 Broken lines represent Amperes and Time. 



impossible to say for how many hours they had been run, 

 but the time probably varied from about 200 to 600 hours, 

 and at any rate none of them were new. 



The measurements were taken at 100 volts, and Harcourt's 

 pentane burner was the standard of light used. 



Candle-Power. 



Watts 

 per Candle. 



Candle-Power. 



Watts 

 per Candle. 



105 



410 



10-5 



404 



119 



3-77 



8-4 



410 



737 



5-41 



9-73 



4-23 



7-65 



4-51 



1005 



419 



12-68 



3-43 



9-78 



4-31 



11-25 



392 





1 



2 E 2 



