94 



MAGIC LANTERN WITH NERNST LIGHT 



[On. Ill 



with the lamp at one end, and a separable plug at the other (fig. 

 49 A). The plug is of standard size and can be screwed into the 

 socket or receptacle of any incandescent lamp. 



To light the lamp turn the key switch of the socket as for an 

 incandescent lamp, and in a minute or longer the glower or glowers 

 will attain their full brilliancy, and one can use the lamp as long 

 as desired without further attention. 



FIG. 55. NERXST LAMP OR SCHWANN-LIGHT. 



(Cut loaned by the Chas. Beslcr Co.}. 



If one uses a three or four glower lamp drawing about four 

 amperes of current there might be a short circuit in the incandes- 

 cent lamp socket if the snap switch were turned off slowly. If that 

 is used, turn it as quickly as possible (see 133). Pulling the 

 separable attachment plug apart will avoid all danger ( 133). 



144. Nernst lamp and direct current. If one has a direct 

 current lighting system, then the Nernst lam]) must be adapted to 

 that, and must be connected properly as with the direct current arc 

 lam]). The two connections with the lam]) are marked, plus (-{-) 

 and minus ( ); or positive (P) and negative (N); and the corre- 



