evans' short-version of the root locus idea

1. Evans sought comments on long and short versions of his pre-publication root locus paper from two of his GE Advanced Course instructors: Louis Rader and Orrin Livingston.  
2. Told that the  paper was unclear, Evans attempted a ""sporting idea": an even shorter version explaining how he hit upon the idea over a three year period: 1946 to 1949.Orrin Livingston was 22 years into a 45 yeat career at GE, during which his name was affixed to 57 patents.

Evans summary of the classical approach concluded it was tedious to determine the roots and so that route to learning the dynamic behavior was too tedio us and so it was abandoned in favor of a different method using Bode and Nyquist's  "Frequency Response" technique.