Tests of household electrical appliances
A 1909 University of Illinois engineering thesis by Wilbur Clinton Maddox on tests of household electrical appliances, submitted as typescript with hand-plotted data sheets. The plates are ink curves drawn on pale green Eugene Dietzgen graph paper — radiation and energy distribution diagrams, crossing load curves lettered A to D, plus faint typewritten pages — useful as gridded backgrounds, chart line work, and early technical lettering.
