Dynamo electric machinery; its design, construction, and operation; direct-current machines
A 1915 engineering textbook by Samuel Sheldon and Erich Hausmann, published in New York by D. Van Nostrand for students and practicing electrical engineers studying direct-current dynamos and motors. Line diagrams show armature windings, commutators, field poles and brush gear in section and plan, with hatched iron, dotted flux paths and lettered keys useful as circular schematic motifs.
