Projector Arc Lamps. Nernst Projection Lamps. 



171 



50 898. 1 : 7. 



50 923. 1 : 3. 



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50,898. Projector Arc Lamp with auto-regulation, Figure, for 10 30 amperes Direct 

 Current, with fixed illumination point and pointed arc, with arrangement for adjusting 

 vertically and laterally, the carbons being at an acute angle relatively to each other 



Cored Carbons for Arc Lamps. 



Price per 1 



Price per 1 



Solid Carbons for Arc Lamps. 



List Xo. 50,912 50,913 50,914 50,915 50,916 50.917 50,918 50,919 50.920 50,921 



Diameter 6 7 8 9 10 11 12 13 14 15 mm 



Pi ice pei 1m length 2 d. 3d. 3 1 2 d. 4 d. 5 d. 5 1 s d. 6 d. 6 1 . ., d. 7 d. 8 d. 



No extra charge is made for cutting the carbons to a definite length or for pointing on one 

 side. It is absolutely necessary if the lamp is to burn well that carbons of correct length be employed. 

 When forwarding orders, therefore, kindly state diameters and lengths of the carbons supplied by us 

 or, in the case of new orders, quote the necessary length of carbon as well as the kind of current and 

 amperage used. 



50,922. 6 Cored Carbons filled with Salts, for spectrum experiments, together with the cor- 



responding solid carbons, each 100 mm long. Price together ........... ; 0. 9. 



Each carbon is filled respectively with salts of sodium, potassium, barium, strontium and cal- 

 cium. If desired, we also supply other fillings at special prices to be arranged. 



5(1.923. Nernst Projection Lamp with triple glower (Greil's), Figure, about 500 metric 

 C. P. at 110 volts, for connecting up to from 100 200 volts; current consumption 

 4 amperes ................................... ' 1. 10. 



This lamp gives a very brilliant light with a small current -consumption, and it may be connected 

 up to any glow lamp lead. Special resistances are unnecessary. The lamp must be heated at first 

 by a gas or spirit flame. When ordering, kindly state network voltage and type of current. 



50.924. Spare Burner with 3 glowers ......................... 0. 7. 



Burner Base for 100160 volts ........................ 0. 3. 6 



- - do., for 161260 volts .......................... 0. 3. 6 



50.927. Interchangeable Glowers for Xo. 50,923 ................. Each 0. 1. 3 



50.928. Series Resistance for Xo. 50,923 .................... Each 0. 1. 3 



50.929. Nernst Projection Lamp, self-igniting, adaptable for 65 300 volts, current- 

 consumption 4 amperes ........... ................. 1.17. 



The candle power is increased with rise in the working voltage. At 110 volts it is about 700 metric 

 and at 220 volts about 1400 metric candles. 



When ordering, kindly state working voltage and kind of current. 



50.930. Spare Burner ..................... ........... 0. 12. 



50,925. 

 50,920. 



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50.931. Series Resistances ........................... Each 0. 1. 3 



50.932. Focus Glow Lamp, of about 100 metric candles, with silver reflector, on adjustable 



stand, suitable for all projection lanterns .................... 2. 0. 



The glow lamp is supplied for a working pressure of 110 volts. 



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

 arc light regulators used with Direct Current; while for Alternating Current it is advisable to use 

 either Transformer Xo. 50,880 or 50,881. 



Cl. :.2T1, 2621. 



