Wiring diagrams of electrical apparatus and installations
A 1913 McGraw-Hill technical manual collecting wiring diagrams for electrical apparatus and installations, issued in New York for electricians, engineers and wiremen. The plates are line schematics on tinted paper: motor starters, transformers, compensators, switchboards and relay contacts drawn as boxes, coils, zigzag resistors and looping conductors, with handwritten labels — useful as abstract linework, technical pattern, or diagrammatic ornament.
