118 



Experimental Switchboards and Experimental Resistances. 



No. 50481- 



Direct Current Experimental Switchboards with I Circuit and with Air-damped 



Instruments. 



50,481. Experimental Switchboard Type A-_>, Wall Pattern, for connecting to 110 160 volts 

 Direct Current, and for taking currents of 0.03 30 amps, and pressures of 0.3 110 

 (or 160) volts from the main, with air damped measuring instruments of 120 mm scale 

 diameter, and Double Switch Contact Rheostat having 30 steps 



8. d. 



22. 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. 14. 



The switchboard carries: 1 36-ohm Rheostat variable in 30 steps and for a max. load of 5 to 

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

 1 main switch (quick break); 1 ammeter; 1 voltmeter; 1 voltmeter switch; 1 switch for the shunt for 

 obtaining division of potential; 1 plug box with plug and 4 m flexible. 



Portable Type as F i g. 50,471 A Extra j 0.10. 



Sliding Rheostat for fine regulation, fitted on switchboard, adaptable for up to 20 amps., having resistance 



of 0.9 ohm Extra 1. 5. 



50.482. Portable Experimental Switchboard Type A->, resting on stout rollers, apparatus and j 

 instruments exactly as in Switchboard 50,481 24. 0. 



Weight, net, about 87 kg; gross, about 130 kg. Packing for land transport 0. 15. 



50.483. Experimental Switchboard, Type B-.>, Wall Pattern, for connecting to 220 volts Direct 

 Current; for taking currents of 0.04 20 amps, and pressures of 0.4 220 volts from 

 the network, with air-damped instruments of 120 mm scale diameter and Double Switch 

 Contact Rheostat having 30 stages 22. 5. 



Weight, net, about 82 kg; gross, about 125 kg. For dimensions, see dimension sketch and table 

 on p. 113. Packing for land transport 0. 14. 



The switchboard carries: 1 48-ohm Rheostat variable in 30 steps and for a max. load of 5 to 

 20 amps., with Double Switch Lever with 30 contacts; 2 terminals for connecting up to network; 2 fuses; 

 1 main switch (quick break); 1 ammeter; 1 voltmeter; 1 voltmeter switch; 1 switch for the shunt for 

 obtaining division of potential; 1 plug box with ping and 4 m flexible. 



For Currents to 30 amperes Extra 3. 10. 



Portable Construction as F i g. 50,471 A Extra 0.10. 



50.484. Portable Experimental Switchboard Type B-> resting on stout rollers; apparatus and 

 instruments exactly as in Switchboard 50,483 21. 5. 



Weight, net, about 100 kg; gross, about 150 kg. Packing for land transport 0. 15. 



50.485. Experimental Switchboard Type d, Wall Pattern, for connecting up to 110 volts Direct 

 Current, for taking currents of 0.04 20 amps, and pressures of 0.4 110 volts from 

 the network; with air-damped instruments of 120 mm scale diameter and with Double 

 Switch Contact Rheostat having 21 stages . . J17.10. 



Weight, net, about 50 kg; gross, about 76 kg. For dimensions, see dimension sketch and table 

 on p. 113. Packing for land transport 0. 12. 



The switchboard contains: 1 24-ohm Rheostat variable in 21 steps and for a max. load of 

 from 520 amps., with Double Switch Lever having 21 contacts; 2 terminals for connecting up to the 

 main; 2 fuses; 1 main switch (quick break); 1 ammeter; 1 voltmeter; 1 voltmeter switch; 1 switch 

 for the shunt for obtaining division of potential; plug box with plug and 4 m flexible. 



Portable Construction as F i g. 50,471 A Extra 0.10. 



50.486. Travelling Type Experimental Switchboard (Type C->), resting on massive rollers; appa- 

 ratus and instruments^exactly as in Switchboard No. 50,485 19.10.0 



Weight, net, about 68 kg; gross, about 105 kg. Packing for land transport 0. 12. 



50.487. Dismountable Experimental Switchboard (Briisch's), Figure, with leads laid in 

 the open; for connecting up to 110 volts Direct Current, for taking currents of 0.03 

 to 30 amps, and pressures of 0.3 110 volts from the main; Portable construction, on 



wood slab 26.10.0 



This switchboard is suitable for educational purposes and for the laboratory; the more important 

 apparatus can be detached and used singly. The volt- and ammeter are fitted to special wood sockcls. 

 The switchboard carries: 1 plug for inserting in a plug box connected with the main by the length 

 (2 m) of flexible supplied; 2 fuses; 1 main switch; 1 contact plate for rapidly removing the ammeter j 

 from the main lead and switching it into the lead being used; 1 ammeter; 1 main rheostat; 1 plug 

 box with plug and 4 m flexible for connecting up the apparatus; 1 shunt regulator; 1 switch for the 

 shunt for division of potential; 1 voltmeter; 1 voltmeter switch; 1 contact plate for connecting up 

 a further ammeter for exact measurements, 1 galvanometer, precision instrument or the like. 



The, main and shunt regulators fitted to the slab can be used separately as Brusch Double Switch 

 Contact Resistances (see No. 50,516 and No. 50,518) (1) as series resistance, (2) as shunt resistance for 



