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



Experiment 6. — No. 5 Lamp. 



Filament. 



Shunt. 



Eemarks. 



Volts. 



| Amperes. 



Calculated 

 resistance 

 (hot). 



Calculated 

 E.M.F. 



Current in 

 | milliamperes 



Ohms. 







ohms. 





volts. 









50 















a + , c — , Fig. 1. 



60 















70 



0-55 



127-3 



•> 











80 



0-65 



123-1 













84 



70 



120 













86 



73 



117-8 













88 



75 



117-3 













90 



0-77 



116-9 













92 



0-80 



115-0 













94 



0-82 



114 -6 













96 



0-85 



113 





* 



No cur 



rent. 





98 



0-87 



112 6 











Blue effect visible in bulb. 



100 



0-89 



112 4 













102 



0-93 



109-7 













104 



0-96 



108-3 













106 



0-99 



107-1 











Blue effect strong in bulb ; 

















none in tube. 



108 



1-01 



106-9 













110 



1-05 



104 -7 













Recommenced Experiment with 100 volts. 



Filament. 



Shunt. 





Volts. 



Amperes. 



1 Calculated 

 ' resistance 

 (hot). 



' Calculated 

 E.M.F. 



Current in 

 milliamperes. 



Ohms. 



Eemarks. 



100 

 102 

 104 

 106 

 108 

 110 

 112 

 114 

 116 



118 

 120 



0-89 

 93 

 0-96 



0- 99 



1- 01 

 1-05 

 107 

 1-11 

 1-14 



1-18 

 1-22 



ohms. 

 112 -4 

 109-7 

 108-3 

 107-1 

 106 -9 

 104-7 

 104-7 

 102-7 

 101-8 



100-0 

 98-36 



volts. 



11-3 

 10-9 



•049 

 •049 



•073 

 •146 

 •195 

 •24 



•39 

 •49 



29,000? 

 22,300 



a + , c— , fig. 1. 



Blue effect entering tube. 



j* Deflection too low to enable 

 < resistance to be properly 

 |_ measured. 



