an Incandescent Paper-carbon Horseshoe Lamp. 25 



bearing on the question of power consumed and light pro- 

 duced, it will be seen that this line of investigation hardly 

 promised enough to warrant us in pursuing it. For example, 

 if the carbon loop were surrounded by a less perfect vacuum, 

 or by one or another gas such as nitrogen or hydrogen, there 

 might be great differences in temperature even with the same 

 resistance and current, or total heat. 



Energy transformed into heat, and into 



| 



i 



heat and light in loop of lamp. 



Resistance, 

 in ohms. 



Candle-power. 







As foot- As horse- 



As total heat- 







pounds, power. 



units. 







66 -002 



•0855 



114 







83 -0025 



•1069 



112 



Just visible. 



122 -004 



•1710 



111 



Dull red. 



244 -008 



•342 



106 



Cherry-red. 



488 -016 



•684 



94 



•016 



792 024 



1-026 



90 



•10 



1254 -038 



1-624 



84-4 



•59 



1452 -044 



1-881 



84 



•83 



1518 -046 



1-966 



83-3 



1-10 



1650 -050 



2-137 



82-5 



1-5 



2343 -071 



3-035 



80 



4-5 



2838 -086 



3-676 



77-6 



9-2 



3828 -116 



4-958 



74-5 



200 



Fur. 2. 





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.12 



