JAN 11 1S21 



THE TRANSIENT PROCESS OF ESTABLISHING A 

 STEADILY ALTERNATING CURRENT ON A LONG 

 LINE, FROM LABORATORY MEASURE- 

 MENTS ON AN ARTIFICIAL LINE. 



By a. E. KENNELLY and U. NABESHIMA. 

 (Read April 22, ig2o.) 



The purpose of this paper is to make a contribution to the theory, 

 records and measurement technique of transient electromagnetic 

 wave propagation over long uniform conductors, with particular 

 reference to the upbuilding of the alternating-current steady state 

 over long alternating-current power-transmission lines, from meas- 

 urements made on artificial power-transmission lines in the 

 laboratory. 



As is shown in the appended bibliography, the subject has been 

 already developed to a considerable extent from the theoretical side. 

 Very little, however, seems to have been published on the practical 

 side. The research here described has been mainly directed to the 

 practical side of the subject, from the laboratory viewpoint. It was 

 taken up in October, 191 7, in thesis work towards a master's degree.^ 

 It was later continued from May, 1919, to the present date, as a 

 research in the electrical Research Division at the Massachusetts 

 Institute of Technology. 



Classification of Transients. — For the purposes of discussion 

 and analysis, it is desirable to establish certain provisional defini- 

 tions relating to transient electromagnetic phenomena, in order to 

 avoid ambiguity. 



A transient may be defined as a temporary and evanescent dis- 

 turbance in an electric circuit, or in the indications of apparatus 

 connected therewith, due to any arbitrary sudden change imposed 



1 Bibliography 36. 



325 



PROC. AMER. PHIL. SOC. VOL. LIX, u, DEC. I4, I92O. 



