NO. 50504. Direct Current Experimental Switchboards with 2 Circuits for Connecting up to Three-wire Mains. 



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50504. 1:16. 



of the accumulator in series or parallel either singly or in pairs; 3 2-pole switches for the galvanometer 

 lamps; 1 2-pole switch for the projector lamp; 3 glow lamps with wall sockets and 1 double-pole 

 switch for charging the accumulators; in addition to the necessary terminals, resistances, leads and 

 4 m flexible. 



s. d. 



:><>.. ->o4. Experimental Switchboard for connecting up to Three-Wire Direct Current Systems 

 of 2 xllO volts (F i g u r e), for connecting the experimental board (1) to 2 xllO volts 

 without regulating resistance. (2) to 110 or 220 volts without regulating resistance, 

 (3) to 110 volts -with regulating resistance in series, (4) to 220 volt-s with regulating resis- 

 tance in series; also for charging Accumulators. A- Mipplied to the Luisenschule. 

 Diisseldorf " 60. 0. 



The switchboard contains the apparatus for 5 circuits, viz.: 1 3-pole switch: 3 2-pole switches; 

 1 2-pole change-over switch with necessary fuses: 2 Switch Regulators each with 10 stages, one for 

 coarse and one for fine regulation; 1 multiple commutator: 1 lamp-battery of 10 lamps with main 

 fuse and single fuses: 1 single-pole shunt switch: 1 2-pole change-over switch, for switching in the 

 lamp battery as a shunt: 1 dead-beat precision voltmeter with switch: 1 switch for the voltmeter; 1 dead- 

 beat precision ammeter with switch: 1 change-over switch for the ammeter. The following are given 

 in with the board: 4 m triple flex.; 4 m twin flex, together with the necessary plug boxes and plugs 

 and 1 resistance, to be fitted separate from the switchboard, with connecting leads and the necessary 

 terminals. 



The permissible load of the rheostat is, according to the position of the Switch Lever on the 

 contacts, 10 30 amps.: pressures of 2, 4, 8, 12 or 24 volts can be taken from the accumulators by 

 means of the multiple commutator. In order to render the leads behind the switchboard readily 

 accessible. the wall can be cut away behind the switchboard. 



Cl. 3220. 3907. 



