114 



Experimental Switchboards and Experimental Resistances. 



No. 50471 



f* /I: \ 



I 



50471. 1:8. 



50 471 A. 1:11. 



Prices. * * 



The currents and voltages given assume the resistance of the apparatus to be connected ; 

 up to be 10 ohms. 



Direct Current Switchboards with I Circuit, 

 with Standard Instruments. 



50,471. Experimental Switchboard Type Ai (Wall Pattern), Figure, for connecting to 

 110160 volts C. C., for taking currents of 0.03 30 amperes and vojtages of 0.3 110 

 (or 160) volts from the main, with standard pattern instruments and Double Switch 

 Contact Current Regulator with 30 stages 24. 0.0 



Weight, net, about 70 kg; gross, about 105 kg. For dimensions, see dimension sketch and table 

 on p. 113. Packing for land transport. 0. 15. 



The Switchboard carries: 1 rheostat of 36 ohms variable in 30 stages, for a max. load of 5 to 

 30 amps., with Double Lever Switch having 30 contacts; 2 terminals for connecting up the network; 

 2 fuses; 1 main switch (quick break type); 1 dead-beat standard ammeter; 2 measuring resistances; 

 1 ammeter switch; 1 dead-beat standard voltmeter; 1 voltmeter switch; 1 switch for the shunt for 

 potential-distribution; 1 plug box with plug, and 4 m flexible. 



When ordering, please give network voltage. If this is not stated, the voltmeter is arranged 

 for 125 volts. 



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



Portable Construction as in Pig. 50,471 A '. Extra 0. 10.0 



Sliding Rheostat for fine Regulation, fitted on the panel, adaptable to 20 amps., with a resistance of nearly 



0.9 ohm Extra 1. 5. 



Resistance and Double Switch Contacts separate from the panel, and arranged so as to be portable 



(Fig. 50,471 B) Extra 5. 0. 



Measuring Instruments with two ranges, Fig. 50,471 C, to admit of the measurement also of small currents 



and voltages Extra 2. 10. 



The ranges are respectively 30 and 3 amps, and 120 and 12 volts, or 160 and 

 016 volts. 



Lamp Resistance, consisting of 4 glow lamps arranged on the slab (F i g. 50,471 D), for putting in series with 

 the current regulator in order to diminish the current consumption in the shunt when low currents 

 are needed; with switch. The lamp resistance can also be used alone, the current being then taken 

 off by a plug box when the lamps are switched in Extra 2. 0. 



Cl. 38, 60. 



