Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise
Nehemiah Hawkins's multi-volume question-and-answer course in electricity, published by Theo. Audel & Co. in New York in 1914 for working engineers, electricians and self-taught students. Line diagrams show dynamo armatures, field coils, magnetic flux paths in dashed lines, hatched pole pieces and plotted current curves, giving designers hard-edged black linework, coil hatching and schematic circle-and-bracket forms.
