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Proportion, or, The geometric principle of beauty, analysed (1843)
Hay, D. R. (David Ramsay), 1798-1866 · Edinburgh and London, W. Blackwood and Sons · leaf 91
PLATE VIII . Harmonic Diagrams Figure I . Figure 3 . Mixture <>/'////" Three primary Divisions />// 2. 3an£L3 producing Division of 'ike quadrant />// Twelve producing the>ffarmanic angles. 7?30;i5?22?30", 30? 3 7 "30! and 45? ///r Ffarmanii: ant/Irs 4~>" !>(>''.'W'! I.i'.'.'l'.'aiid 22 "3d' Figure…Proportion (Art)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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