Where can I find articles about Handley Page multi element segmented airfoils? Can anyone direct me to a source containing the complete article on Handley Page's 6 and 8 element airfoils from Flight magazine Feb 24, 1921 (PDF) or further more detailed information on this subject.
The images look a lot like the ones in:

A.M.O. Smith, “High-Lift Aerodynamics”, 37th Wright Brothers Lecture, Journal of Aircraft, Vol. 12, No. 6, June 1975

The  classic paper on multi element airfoils, great read!