Proportion, or, The geometric principle of beauty, analysed (1843)
Hay, D. R. (David Ramsay), 1798-1866 · Edinburgh and London, W. Blackwood and Sons · leaf 79
GEOMETRIC PRINCIPLE OF BEAUTY ANALYSED. 53 into three equal parts — Figure 37 ; and if from the points at which these parallel lines cut the periphery of the circle, other straight lines are drawn to the points of contact, the diagram, containing a complete series of the rectilinear figures, will… … These lines form right angles with the side of the exterior square, angles of 30° with any radius that meets them from the centre of the circle, and angles of 60° with the lines drawn to the point of contact, and they inscribe the inner circle by a square half the perimeter of the exterior one. If…
Proportion (Art)
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Champ fleury : au quel est contenu lart & science de la deue & vraye proportio[n] des lettres attiques, quo[n] dit autreme[n]t lettres antiques, & vulgairement lettres romaines proportionnes selon le corps & visage humain ... (1529)](https://img.insideoutlibrary.com/img/200/ia-champfleuryauque00tory-121-83.webp)
