Aircraft design data ..
A 1919 engineering data volume from the United States Navy Department's Bureau of Construction and Repair, printed in Washington by the Government Printing Office, covering airplane and airship aerodynamics. The pictures are plain graph-paper plots titled Curve of Center of Pressure Travel against Angle of Incidence, with a single black line rising or dipping across a fine grid. A designer might take the grid layout and restrained cream-and-ink chart styling as a model for technical data sheets.
