Practical electricity .. with questions and answers
A 1911 instructional manual on practical electricity, compiled by the Cleveland Armature Works and John C. Lincoln in Cleveland, Ohio, for electricians and shop apprentices studying by question and answer. The 77 line diagrams show armature windings between labelled magnet poles, commutator segments, and meter dials with arcing scales — thick-stroked schematic shapes and lettered arrows usable as technical ornament.
