Things a boy should know about electricity
An instructional electricity manual for boys written and published by Thomas M. St. John in New York in 1900, aimed at young amateurs building their own apparatus. The 170 wood-engraved figures show induction coils, static machines, batteries, bells and switch mechanisms in three-quarter view, densely hatched on white ground — useful as isolated machine silhouettes, texture studies, or technical diagram parts.
