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Experimental Switchboards and Experimental Resistances. 



50,492. Experimental Switchboard with 2 Circuits, WaH'Pattern (Type EI), Fig. 50,490, for s. d. 

 connecting up to 220 volts Direct Current, and for taking currents of 0.04 20 amps, 

 and. pressures of 0.4 220 volts in each of the circuits; with Standard Instruments and 



Double Switch Contact Eheostat with 30 stages 41.10.0 



The switchboard contains in each of the two circuits: 2 fuses; 1 main switch; 1 dead-beat stan- 

 dard ammeter; 1 ammeter switch; 1 48-ohm rheostat variable in 30 steps, and for max. load of 5 to 

 20 amps. ; 1 Double Lever Switch with 30 contacts; 1 plug box with plug and 4 m flexible; 2 terminals 

 for connecting the switchboard to the network. The board also has for the two circuits in common: 

 1 dead-beat precision voltmeter and 1 voltmeter switch for 4 circuits. 



Sliding Rheostat for fine regulation, fitted to the board, adaptable for up to 20 amps., and having a resistance 



of about 0.9 ohm Extra for the 2 circuits 2. 10. 



Fitting a Lamp Bracket for lighting purposes, with switch and 2 fuses Extra 1. 0. 



Measuring Instruments with 2 Ranges, from 30 and 3 amps, and 220 and 22 volts . . Extra 3. l.~>. o 



50,493. Travelling Type Experimental Switchboard with 2 Circuits, Type E, (cf. F i g. 50,472), 



resting on stout castors; apparatus and instruments exactly as in No. 50,492 .... 44. 



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50,494. Experimental Switchboard with 2 Circuits, Type Fi (Wall pattern), cf. Fig. 50,490, 

 for connecting up to 110 volts Direct Current, and for taking currents of 0.04 20 amps. ' 

 and pressures of 0.4 110 volts in each circuit; with Standard Instruments and two 

 . Double Switch Contact Eheostats with 21 steps 29. 0. 



The switchboard contains in each of the two circuits: 2 fuses; 1 main switch; 1 dead-beat stan- 

 dard ammeter; 1 ammeter switch; 1 switch for the shunt; 1 24-ohm Rheostat variable in 21 stages 

 and for a max. load of 5 20 amps.; 1 Double Switch Lever with 21 contacts; 1 plug box with plug 

 and 4 m flexible; 2 terminals for connecting the switchboard to the network. The board also has 

 for the two circuits in common: 1 dead-beat standard voltmeter and 1 voltmeter switch for 4 circuits. 



Fitting a Lamp Bracket for lighting purposes, with switch and 2 fuses Extra 1. o. n 



Sliding Rheostat for fine regulation, fitted to the board, adaptable for up to 20 amps., and having a resistance 



of about 0.9 ohm Extra for the 2 circuits 2. 10. 



Measuring Instruments with 2 Ranges, from 30 and 3 amps, and 120 and 12 volts 



Extra 3. 15. 



50.495. Travelling Type Experimental Switchboard with 2 Circuits (Type Fi), cf. Fig. 50,472, 

 resting on stout castors; apparatus and instruments exactly as in No. 50,494. . . . j 31.10. 



Direct Current Experimental Switchboards with 2 Circuits for Equal Currents, 

 and with Air-damped Measuring Instruments. 



50.496. Experimental Switchboard with 2 Circuits, Type D 2 (Wall Pattern), cf. F i g. 50,490, 

 for connecting up to 110 160 volts Direct Current, and for taking currents of 0.03 to 

 30 amps, and pressures of 0.3 110 (or 160) volts in each of the two circuits; with air- 

 damped measuring instruments having a scale-diameter of 120 mm and two Double 

 Switch Contact Eheostats with 30 stages 38. 0. 



The switchboard contains in each circuit: 2 fuses; 1 main switch; 1 ammeter; 1 switch for the 

 shunt for division of potential; 1 36-ohm Rheostat variable in 30 steps, for 5 30 amps. max. load; 

 1 Double Switch Lever with 30 contacts; 1 plug box with plug and 4 m flexible; 2 terminals for con- 

 necting the switchboard to the network. The board also has in common for the two circuits: 1 volt- 

 meter and 1 voltmeter switch for 4 circuits. 



Sliding Rheostat for fine regulation, fitted to the switchboard, adaptable for up to 20 amps., and having a 



resistance of about 0.9 ohm Extra for both circuits 2. 10. 



50.497. Travelling Type Experimental Switchboard, Type~D:. (cf. Fig. 50,472), resting on 

 massive castors; apparatus and instruments exactly as in No. 50,496 40.10.0 



50.498. Travelling Type Experimental Switchboard (Type E 2 ), cf. F i g. 50,490. for connecting 

 up to 220 volts Direct Current, and for taking currents of 0.04 20 amps, and pressures 

 of 0.4 220 volts in each of the two circuits; with air-damped measuring instruments 



of 120 mm scale-diameter and two Double Switch Contact Eheostats with 30 stages 38.10.0 



The switchboard contains in each circuit: 2 fuses; 1 main switch; 1 ammeter; 1 switch for the 

 shunt for obtaining division of potential; 1 48-ohm rheostat variable in 30 steps and for 5 20 amps, 

 max. load; 1 Double Switch Lever with 30 contacts; 1 plug box with plug and 4 m flexible; 2 terminals 

 for connecting the switchboard to the network. The board has in common for both circuits: 1 volt- 

 meter and 1 voltmeter switch for 4 circuits. 



Sliding Rheostat for fine regulation, fitted to the switchboard, adaptable for up to 20 amps, and having a 



resistance of about 0.9 ohm Extra for both circuits 2. 10. 



50,499. Travelling Type Experimental Switchboard with 2 Circuits, Type E-> (cf. F i g. 50,472), j 

 resting on stout castors; apparatus and instruments exactly as in No. 50,498 . . . . 1 41. 



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