Arrangement of Connections. 



Ill 



Networks Terminals 



03 



a 



c 



s 



o 



x 



S3 



Current Regulator with 

 Double Switch Contact 



Switch for Shunt 



Scheme I. 



The thickness of the wire forming the resistance spirals increases in steps for a maximum 

 continuous load of I, in Type A 5 30 amps., in Type B 5 20 amps, so that even when the plug box 

 is short circuited or w y hen the resistance of the apparatus put in the circuit is very low (e. g., in 

 glowing experiments), the resistance spirals do not become unduly heated when only Switch Con- 

 tact I is used and the currents of 30 and 20 amps, respectively are not exceeded. As a rule Switch 

 Contact I will first be placed on 0, and Switch Contact II on the highest resistance value to the 

 right, and then Switch Contact I will be turned backwards; finally, the current is slightly increased 

 with the aid of Switch Contact II. 



A^ the charging of accumulators is of interest, we will illustrate this by an example. Let us 

 suppose a (i-cell battery with a charging current of 6 amps. These cells have a pressure of 12 volts, 

 and at 110 volts working pressure there i> thus llo 12 =98 volts to overcome, requiring, with a 



98 

 current of 6 amperes. ' = 16.33 ohms. At 220 volts 220 12 == 208 volts have to be overcome, 



"OS 

 necessitating " - 34.66 ohms. The current regulator is thus sufficient in these cases. If. on the 



6 



\ 



Cl. .Miiii. 



