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Journal Article Playfair and his Charts Get access H. Gray Funkhouser, H. Gray Funkhouser Phillips Exeter Academy, Exeter, N. H. Search for other works by this author on: Oxford Academic Google Scholar Helen M. Walker Helen M. Walker Columbia University, New York City Search for other works by this author on: Oxford Academic Google Scholar The Economic Journal, Volume 45, Issue Supplement₁, 1 January 1935, Pages 103–109, https: //doi. org/10. 1093/ej/45. Supplement₁. 103 Published: 01 January 1935
Funkhouser et al. (Tue,) studied this question.