128 



Experimental Switchboards and Experimental Resistances. 



No. 50 537 



50537. 1:10. 



50 539 et 50 543. 1 : 7 



X 



o 

 ff 



re 



50544. 1:5. 



50 547. 1 : 14. 



50.537. Large Sliding Resistance, Figure, with two windings^of different thickness, can d. 

 be used in various directions as a series or shunt resistance; about 50 ohms for 5 am- 

 peres and 350 ohms for 2 amperes 4. 15. 



50.538. - - The p receding, about 36 ohms for 8 amps, and about 350 ohms for 2 amps. 4. 15. 



Graphite Resistance, adjustable by depression screw: 



List No. 

 Amps. 



Resistance ( from 



adjustable ( to 



Prices 



The material of which the resistances are made up is cotton and graphite. The currents given j 

 can be used without overheating when the resistance is used to its fullest extent; the resistances can 

 also be overloaded. 



50,543. Intermediate Terminal for cutting out a portion of the resistance or introducing a shunt, FigureO. 5. 



Carbon Plate Resistance, Figure, substantially constructed, for large currents. 



List No. 

 Amps. 



Resistance ( from 



adjustable I to 



Prices 



50,547. Carbon Resistance (Gross'), Figure, water-cooled, regulation being obtained by 



adjusting a mercury level; for 120 volts and 8 60 amperes 6. 15. 



The resistance of two carbon rods in series can be finely regulated by adjusting the mercury 

 level. The portion of the rod-shaped resistance traversed by the current is surrounded by cold water. 



II 



3 

 



Cl. 5318, 5256, 

 2790, S554. 



