1885.] ivhen raised to High Incandescence. 221 



Experiment 1. 



Filament. 



Shunt. 









Ti © 



rri 



CO 



d b. 





K-emarks. 



Volts. 



CO 



ulate 

 stanc 

 t). 



ilatei 

 I.F. 



•S '© 



stanc 







Amp 



Calc 

 resi 

 (ho 





II 



"to 









ohms. 



volts. 









A A • /< A 



0-7 



63 -4 













0-75 



62 17 



•• 



* * 



... 



JN ormal incandescence, viz., 8 

 candles. 



AO .OA 



4o O'l 



0-81 



60-30 











Kl 'Oft 



0-86 



59-37 











CO ,QQ 



Oo Zo 



0-91 



58-55 



i a .n 



14 7 



U OU 



y4A AAA 



4y,ouu 





00 OU 



0-97 



57 -21 







Diffused blue effect in globe 

 appeared. 



0/ /Z 



1-02 



56-60 



lo o 



1 .IK 

 1 10 



1 A KAA 

 14,0UU 





EQ .Q/( 



oy y4< 



1-08 



55-50 



16 "2 



1 OU 



9,000 







1-13 



55-01 



10.K 



lo 



2-70 



5,000 





CA. QQ 



1-20 



53-66 



11 9o 



o OO 



3,000 





DO OU 



1 -24 



53-71 



7*45 





1,400 



^Jjiue ettect brilliant. 



Do OA 



1-24 



55-51 



10 00 



UU 



2,000 



/ 1 U4 



1-30 



54-65 



9-10 



o uu 



1,300 





/TO .0£ 



/o Zo 



1-35 



54-28 



6-50 



o uu 



1,300 

 1,700 





75 -48 



1-35 



55-92 



9-35 



5-50 





77-70 



1-41 



55 12 



9-60 



6-00 



1,600 





79-92 



1-47 



54 -38 



9-80 



7-00 



1,400 





82-14 



1-60 



51-34 







Deflection too unsteady for 



84-36 



1-60 



52-74 



j- criti 



cal poi 



nt | 



observation. Blue effect 



86-58 



1-53 



56-59 







very brilliant. 



88-80 



1-56 



57-00 



50 6 



2-20 



23,000 



91-02 



1-53 



59 -30 



62-5 



2-50 



25,000 





93-24 



1-57 



59 -40 



610 



3-20 



19,000 

 25,000 





95-46 



1-60 



59 51 



95 -0 



3-80 





97-68 



t » 









Filament broke. Interior of 

 globe and faces of plate 

 blackened. 



reached. From that point the current in the filament remained very 

 steady, but the resistance gradually increased. The shunt increased 

 in resistance enormously, and the current through it diminished, 

 although the electromotive force increased very largely. It is remark- 

 able how steady the electromotive force in the shunt remained until 

 the critical point was reached, when it suddenly increased and only 

 reached that of the main current at the point of rupture of the fila- 

 ment. Again the current, which steadily increased until the critical 

 point was reached, then diminished, indicating a considerable increase 

 in the resistance of tbe rarefied space ec. In one subsequent expe- 

 riment, after the critical point was reached, no current could be ob- 

 tained through the shunt. 



