1120 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1953 



regulator is to automatically control the dc plating current in the acid 

 copper plate section through a control system which continuously meas- 

 ures the electrical resistance of the product and signals the need for vari- 

 ation in power in accordance with the variation in resistance. 



All of the rectifiers associated with one machine (Fig. 7), including the 

 "auxiliary" units and those on the regulated feeder, are located in the 

 outer mezzanine bay nearby that machine. The two regulators, although 

 each is associated with a different machine, are both located in the sub- 

 station room on the south side of the building. 



The induction voltage regulators are basically standard regulators of 

 the type used in lighting service but modified slightly by the addition of 

 a control slidewire for electrically indicating the position of the rotor. 

 Each unit is three-phase, self -cooled by non-inflammable liquid, rated at 



Fig. 7 — ElccUiciil heart ot llic elcctroforming process are these rectifiers and 

 controls where alternating current is converted to direct current. 



