170 



Projection Apparatus and Accessories. 



No. 50889 





50889. 1:4. 



50 890. 1 : 4. 



50 893. 1 : 8. 



50 894 50 897. 1 : 5. 



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50.889. Projector Arc Lamp, for hand regulation, Figure, with carbons for placing either 

 vertically or tilted, low type, for currents of to 30 amperes Direct or Alternating Current 4. 



The arc can be adjusted upwards, downwards or laterally by rack and pinion, and the upper 

 carbon holder can be slid backwards and forwards. 



50.890. Projector Arc Lamp, for hand regulation, Figure, for currents to 35 amperes . 2.17. 



50.891. - - do., for currents to 50 amperes 3. 15. 



50.892. - - do., as No. 50,890, without fine motion, for height and lateral adjustment, there- 

 fore with clamping screw 2. 2. 



50.893. Projector Arc Lamp for Direct Current, Figure, for currents to 100 amperes, with 

 universal adjustment by 6 screws 6. 15. 



Simple Projector Arc Lamp for Direct Current, Figure, with auto-regulation, ball and 

 socket joint and height adjustment, intended for use with simple skioptica (W. D., 

 4 th Edition, Fig. 51). 



List No. 50,894 50,895 



Current, amps. 3 6 8 16 



Price 2. 0. 2. 6. 



The preceding, for Alternating Current, Figure. 



List No. 50,896 50,897 



Current, amps. 3 6 8 16 



Price 2. 0. 2. 6. 



The lamps are main current lamps for connecting up singly to 100 220 volts. 



A Series Resistance (Nos. 50,868 -50,879) or a Regulating Resistance (Nos. 9645 9648 d) is necessary for 

 the arc light regulators used with Direct Current; it is, however, advisable to use a Transformer (No. 50,880 

 or 50,881) for Alternating Current. 



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Cl. f.431. 5447, 

 5272, 241. 



