SWITCHING EQUIPMENT 



537 



Pot. and Synch. Receptacles 

 Control Switches ,V Lain; 

 Mimic Buses 



Fid. Rheostat 

 Control 



Instruments 



Meters and 

 Graphic Instrument* 



Relays 



Testing Links 

 and Switches 



for Relays and 

 Instruments 



FIG. 340. Control Board with Independent Instrument Board. This arrange- 

 ment offers more useful surface than does that of Fig. 338. 



Instruments 



Removable 

 Grill Panel! 



View of I | the Machines 



Gallery Rail 



FIG. 341. A Gallery Type of Bench-board which Permits the Operator View- 

 ing the Machines through the Board. 



