122 



Experimental Switchboards and Experimental Resistances. 



No. 50M)2 



30 steps, for a max. load of 5 30 amps.; 1 Double Switch Lever with 30 contacts; 1 check lamp; i s. d. 

 1 plug box with plug and 4 m flexible; 2 terminals for connecting up to the network. 



For the 5-ampere circuit the switchboard contains: 2 fuses; 1 main switch; 1 dead-beat standard i 

 ammeter; 1 switch for the shunt for obtaining division of potential; 1 36-ohm Rheostat variable in 

 21 steps, for a max. load of 5 amps..; 1 Double Switch Lever with 21 contacts; 1 sliding rheostat for 

 fine regulation; 1 plug box with plug and 4 m flexible; 2 terminals for connecting to the network. 



The following are for both circuits in common: 1 dead-beat standard voltmeter; 1 voltmeter 

 switch for 4 circuits; 1 double-pole plug box (with fuse) for 6 amps, for connecting up lamps for light- 

 ing or the like. 



Two-range Measuring Instruments Extra 



M),502 a. Travelling Type Experimental Switchboard, Type Gi, with two circuits for different 

 Current-strengths (cf. Fig. 50,472) ; switches and instruments as in No. 50 502 . . 



Weight, net, about 130 kg; gross, about 190 kg. Packing for land transport 



3. li. 



38.16.0 

 1. 3. 



50 502 b. Experimental Switchboard, Type Hi, Wall Pattern (cf. F i g. 50,502), with two 

 Circuits for different Current-strengths, for connecting up to 220 volts Direct Current, > 

 and for taking currents of 0.04 20 amps, and pressures of 0.4 220 volts from one cir- 

 cuit and currents of 0.01 4 amps, and pressures of 0.4 220 volts' from the other cir- 

 cuit; with Standard Instruments and two Double Switch Contacts with 30 and 21 stages 

 respectively 



Weight, net, about 120 kg; gross, about 175 kg-. Packing for land transport 



36.10.0 



1. 2. 



The switchboard contains for the 20-ampere circuit: 2 fuses; 1 main switch; 1 dead-beat standard 

 ammeter; 1 switch for the shunt for obtaining division of potential; 1 48-ohm Rheostat variable in 

 30 steps, for a max. load of 5 20 amps.; 1 Double Switch Lever with 30 contacts; 1 plug box with 

 plug and 4 m flexible; 2 terminals for connecting up to the network. 



The circuit to 4 amperes contains: 2 fuses; 1 main switch; 1 dead-beat standard ammeter; 

 . 1 switch for the shunt for obtaining division of potential; 1 60-ohm Rheostat variable in 21 steps, for 

 a max. load of 4 amps.; .1 Double Switch Lever with 21 contacts; 1 sliding rheostat for fine regulation; 

 1 plug box with plug and 4 m flexible; 2 terminals for connecting up to the network. 



The following are provided for both circuits in common: 1 dead-beat standard voltmeter; 1 volt- 

 meter switch for 4 circuits; 1 double-pole switch (with fuse) for 6 amps, for connecting up lamps for j 

 lighting purposes or the like. 



Double-range Measuring Instruments Extra 3. 15. 



50,502 c. Travelling Type Experimental Switchboard, Type Hi, with two Circuits of different 



Current-strength (cf. Fig. 50,472); switches and instruments as in No. 50,502 b . 39.10.0 



X 



o 

 sr 



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O 



CD 



B 



8 



Weight, net, about 130 kg; gross, about 190 kg. Packing for land transport 



1. 4. 



Direct Current Experimental Switchboards with 2 Circuits for Connecting up to 



Three-wire Mains. 



* 



The great variety of ways in which these experimental switchboards can be made 

 up has led us to include in this list a few of the examples which we have already 

 constructed. The advantage of a 3 -wire system is that two different voltages are 

 available. In case it should seem necessary, we would ask that an estimate be solicited, 

 stating local conditions and any special wishes. 



50,503. Experimental Switchboard (Wall Pattern) for connecting up to a Three-wire Direct 

 Current System, Figure, for mains of 2 X 110 volts working pressure, for taking 

 40 amperes and 110 volts from one and 30 amperes and 40 volts from the 

 other branch of the network. The current from one branch is intended for feeding the 

 projection lamp, the galvanometer lamps and for the charging of accumulators, the 

 current from the other branch being utilised for experimental purposes. As supplied 

 to the Oberrealschule, Fiirstenwallstrasse, Dusseldorf 



The switchboard is fitted with the following apparatus: 1 3-pole main switch for 40 ami's.. 

 encased pattern; 10 40-amp. fuse plugs; 4 plug boxes with plugs for 30 amps., one each for the m.'iin 

 circuit, for the lamp circuit, for discharging accumulators and for the projection lamp; 1 each dead- 

 beat standard ammeter for 40 and 30 amps.; 1 each dead-beat standard ammeter for to 

 120 and 40 volts; 1 change-over switch for alternately putting the shunt resistance in parallel with 

 the main rheostat and with the lamp resistance; 1 voltmeter switch; 1 double-pole switch for con- 

 necting either the main current or the lamp current to the bus-bars of the board; 1 contact circuit each 

 for the main and shunt rheostats ; 10 wall sockets with glow lamps; 10 single-pole switches for preceding; 

 1 contact circuit for the projector lamp; 1 multiple commutator for 4 circuits, for connecting the cells 



71. 0.0 



