Characteristics of a three phase and single phase induction motor
A 1912 University of Illinois engineering thesis by Jefferson Hall Belt and Norris Fay Murray, testing three-phase and single-phase induction motors for faculty examiners. The plates are hand-plotted performance curves inked on printed graph paper, with hand-lettered axis labels for speed, torque, slip, efficiency and amperes, offering grid textures, plotted point markers and draftsman lettering for chart-based layouts.
