Theoretical and experimental investigation of induction machines
A handwritten 1900 engineering thesis by William Frederick Schulz and Harry Curtiss Marble, submitted at the University of Illinois and reporting tests on Wagner induction motors for their degree examiners. Pen-and-ink plates alternate between wiring and stator-winding diagrams with lettered terminals and efficiency curves hand-plotted on printed green-gridded graph paper, giving designers ruled data sheets, plotted point-and-line curves, and looping script annotation.
