Popular electricity in plain English
A popular early twentieth-century primer on electricity, published in Chicago around 1908 for lay readers wanting plain-language explanations of the subject. Its pictures are black-and-white technical line drawings and halftone photographs: a detector apparatus with labelled parts, Barlow's wheel with its coil and battery, a steam-driven generator with workmen posed beside it, and a pair of lamps. A designer could draw on their clean diagrammatic labelling and industrial period detail.
