ELECTROFORMED CONDUCTOR FOR TELEPHONE DROP WIRE 1123 



ous danger of electrolytic corrosion at the joints (which necessarily had 

 to be made to copper) from the warm, moist, corrosive atmosphere. The 

 square copper tubing is ventilated by holes drilled in the upper and lower 

 faces to give it comparatively high current carrying capacity with low 

 temperature rise. The fact that the bus is in the form of tubing gives it 

 an inherently high mechanical strength; the supports for the tubing, 

 therefore, could be spaced much farther apart than for ordinary bus. 

 All tubing bus joints are of the compression type made up by the use of 

 standard clamps rather than by brazing or bolting. All of the tubing 

 was purchased cut to size and coded. During installation, the prepara- 

 tion of the joining surfaces was carried out on benches in the area. Such 

 planning resulted in an exceptionally easy and rapid installation. 



A complete picture of the electrical operation of a given machine is 

 provided to the operator through a control console located in the op- 

 erating bay of the mezzanine (Fig. 8). On the control console are located 

 the tapswitches for adjusting the output of the "auxiliary" rectifiers, 

 an anmaeter and a voltmeter for each rectifier (a total of forty-six such 

 meters per machine), a meter which indicates wire speed, switches for 



" Fig. 8 — Control console for the entire process is readily available when neces- 



sary. 



