SUMMARY FOR SMALL CURRENT LIGHTS [Cn. Ill 



Do 



1. Wire for the Mazda lamp 

 exactly as for any incandescent 

 bulb lamp. 



2. Turn the lamp on and off 

 by the key switch as for any 

 incandescent lamp. 



3. As this light is relatively 

 dim, make the room dark and 

 project a small picture. 



It is also wise to have one or 

 more extra bulbs in case one 

 burns out. 



Do NOT 



1 . Do not use a rheostat with 

 a Mazda lamp. 



2. Do not take any more 

 trouble with the concentrated 

 filament Mazda than for any 

 bulb lamp. 



3. Do not try to make too 

 large a screen picture; and do 

 not have the room as light as 

 for the arc lamp. 



4. Turn the lamp on and off 

 whenever desired as it gives full 

 brilliancy in an instant. 



4. Do not let the lamp burn 

 all the time during an inter- 

 mittent exhibition any more 

 than with the arc lamp. 



Do 



1. Find out the kind of cur- 

 rent and the voltage wherever a 

 Nernst lamp is to be used. 



2. Purchase a Nernst lamp 

 adapted to the current with 

 which it must be used. 



Do NOT 



1. Do not use a Nernst lamp 

 with a current and voltage for 

 which it was not constructed. 



2. Do not purchase a Nernst 

 lamp for direct current if it 

 must be used on an alternating 

 current line. 



3. A special rheostat or bal- 

 last forms a part of ever) 7 

 Nernst lamp for projection. 



3. Do not insert a separate 

 rheostat in the wiring for a 

 Nernst lamp. 



