FlightPathOBN
See if you can locate details of the Volta Conference 1935.
Area ruling was discussed as early as 1935?
There appears to be some ref to the area rule presented by Adolf Busemann.
At what point did Busemann discover the area rule?
Robert Jones developing the same concept at the same time. (1945)
I knew Robert T. Jones did a lot of research on swept wings which if I recall were based on data reduced from the Gluhareff Delta. I didn't know he was doing research on Area Ruling.