228 Mr. W. H. Preece. Behaviour of Glow-Lamps [Mar. 26, 



Experiment 7. — No. 6 Lamp (long filament). 



Filament. 



Shunt. 



Remarks. 



Volts. 



Amperes. 



Calculated 

 resistance 

 (hot). 



Calculated 

 E.F.M. 



Current in 

 milliamperes. 



Ohms. 







ohms. 













76 















80 



0-57 



140 3 











OA 



0-60 



140 -0 











88 



0-65 



135-4 











92 



0-71 



129-6 











96 



0-75 



128 -0 











100 



0-80 



125-0 









Faint blue in globe. 



104 



0-84 



123-8 





•049 





108 



0-89 



121-3 





•085 



-W ft a> 



§ i g g 





112 



0-94 



119 -1 





•10 





Blue in globe very marked. 



116 



0-99 



117 2 





•073 



<J3 £ 5 5 



120 



1 -06 



113-2 





•20 



sis* 



Bulb hot, tube cool. 



Fig. 5. 



