Tests of Glow-Lamps. 



419 



Six Edison-Swan Lamps, marked " 100 E.F. 8," purchased 

 January 21, 1895, marked by us IX., X., XL, XIL, 

 X1II./XIV , and run at 100 Volts. 



Filaments placed at an angle of 45° with the Photometer- 

 Bench. 



Hours of Running. 



Power, in 



Watts. 



Candle- 

 Power. 



Watts per 

 Candle. 



Lamp No. IX. 













413 



9-70 



4 26 



1 hour 40 minutes. 



41-3 



9-70 



426 



6 hours 10 minutes. 



41-5 



9-;0 



4-28 



13 hours 30 minutes. 



41C> 



967 



4-30 



42 hours 30 minutes. 



419 



9-85 



425 



80 hours 



425 



985 



431 



Lamp No. X. 













40-35 



7-85 



514 



1 hour 45 minutes. 



40-4 



7-95 



5-08 



6 hours 15 minutes. 



405 



7 92 



511 



13 hours 35 minutes. 



406 



7 92 



512 



42 hours 35 minutes. 



409 



8-2 



4-99 



80 hours 5 minutes. 



415 



8-5 



4-88 



Lamp No. XL 













398 



7-89 



505 



1 hour 50 minutes. 



39-8 



8-00 



4-97 



fi hours 20 minutes. 



39-8 



8-11 



4-91 



13 hours 40 minutes. 



39-8 



795 



501 



42 hours 40 minutes. 



398 



8-00 



497 



80 hours 10 minutes. 



401 



8-00 



5-01 



Lamp No. XII. 













39-85 



7-78 



512 



1 hour 55 minutes. 



401 



8-07 



4-97 



6 hours 25 minutes. 



40-25 



805 



5 00 



13 hours 45 minutes. 



4041 



795 



5-08 



42 hours 45 minutes. 



4075 



83 



491 



80 hours 15 minutes. 



41-4 



8-7 



4-76 



Lamp No. XIII. 













40-75 



8-06 



505 



2 hours 



40-6 

 40-5 



8-06 

 8-17 



5-04 

 4-95 



6 hours 30 minutes. 



13 hours 50 minutes. 



40-5 



7-85 



515 



42 hours 50 minutes. 



40-5 



79 



513 



80 hours 20 minutes. 



406 



8-4 



467 



Lamp No. XIY. 













412 



8-49 



4-85 



2 hours 5 minutes. 



412 



8 65 



4-76 



6 hours 35 minutes. 



41-2 



865 



4-76 



13 hours 55 minutes. 



41-2 



8-49 



4-85 



42 hours 55 minutes. 



41-2 



86 



4-80 



80 hours 25 minutes. 



41-5 



8-5 



4*89 



