No. 50480. 



Direct Current Switchboards with 1 Circuit, with Standard Instruments. 



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50 477. 1 : 10. 



50 480. 1 : 18. 



."><>. 4 7S. - T h e preceding, for connecting to a 110 volt Direct Current main, for taking s. d. 

 currents of 0.04 20 amps, and pressures of 0.4 110 volts from the network .... 36. 0. 



The resistance is 24 ohms in 21 steps, for a max. load of 5 20 amps., the two switch levers 

 have each 21 contacts; in other respects this board is similar to Xo. 50.477. 



50.479. Experimental Switchboard for Low Currents, Wall Pattern, for connecting to 110 volts 

 Direct Current, for taking currents of 0.03 5 amps, and pressures of 0,3 120 volts 



from the network, with Double Switch Contact Regulator and Sliding Rheostat ... 23. 0. 



The switchboard carries: 1 Regulating Resistance of 50 ohms, variable in 21 steps, for a max. 

 load of 2 5 amps.; 1 Double Switch Lever with 21 contacts; 2 terminals for the feed supply : 2 fuses; 

 1 main switch (quick break): 1 dead-beat standard ammeter with 2 ranges of 1 and (> 5 amps. 

 respectively: 1 ammeter switch: 1 dead-beat standard voltmeter with 2 ranges of 12 and 120 volts 

 respectively; 1 voltmeter switch; 1 switch for the shunt; 1 plug box with plug and 4 m flexible. 



50.480. Travelling Type Experimental Switchboard for large Currents (F i g u r e), for con- 

 necting to 110 volts Direct Current, for taking currents of 0.1 150 amps, and pressures 

 of 0.3 110 volts from the network; with Double Switch Contact Rheostat and Standard 

 Measuring Instruments 54. 0. 



The switchboard, together with the resistances, travels on rollers, and carries: 1 rheostat of 

 22 ohms, variable in 21 steps, for a maximum load of 5 150 amps.; 1 Double Switch Lever with 21 con- 

 tacts: 2 fuses: 1 main switch; 1 dead-beat precision ammeter; 1 ammeter switch: 1 dead-beat precision 

 voltmeter; 1 voltmeter switch; 1 switch for the shunt for potential-division; 2 terminals each for con- 

 necting up with the network and for the apparatus. 



Cl. 3768, 5112. 



