334 



KENNELLY-NABESHIMA— ESTABLISHING A 



Ammeters and voltmeters of the alternating-current type were 

 introduced, at special times, into the artificial-line circuits, in order 

 to secure calibrations of the oscillograms. The impressed e.m.f, at 

 A ranged, in dififerent cases, from 60 to 100 volts r.m.s. 



Line-Switch Connections. — In order to minimize splash tran- 

 'sients, it was necessary to design and make up a switch, which 

 would connect the 60 '—' alternator to the artificial line at an instant 

 of zero e.m.f. For this purpose, a little 6-pole synchronous motor, 

 running in synchronism with the a.-c. generator, was caused to 

 drive an insulating disk D, Fig. 4, carrying a 60° conducting sector 



To the Generator: 



To the Line, 



K 



Fig. 4. Brush Mechanism. 



S, in such a manner that a pair of insulated brushes B^B^, resting 

 thereon, could be brought into contact, through the sector, at any 

 desired position around its circumference. The final adjustment of 

 phase position was secured by means of the graduated pointer and 

 scale LK, divided into single degrees of arc. One electrical degree 



