Smithsonian Report. 1925. — Peek 



Plate 8 



Fig. 19. -Short Section of a Three-Phase Line with Overhead 

 Ground Wire upon Which a Study Was Made of Induced Voltages 

 BY Lightning 



Photograph show; 



one of the "towors'* and one of tho spark-gap.s used to measure voltage 

 at this point 



Fig. 20. -Lightning Strokes Hitting the Overhead Ground Wire 

 OF A Transmission Line During Study of Lightning voltages 

 Induced on a Three-Phase Line During a Storm 



