he sides at themiddle points. It cuts the diagonals at a distance from the center equal approxi-mately to -^ of the half diagonal. To draw the circle, mark its center and spotfour points as E, F, G, and H equidistant from it. These points are needed not somuch to produce a good curve as to insure… … figure this distance is 4 of the large radius 152. Suppose a circle is placed so its plane is oblique to the plane of projection, or to the picture plane.It may be proved that its projection, or its perspective is an ellipse. The circle has an infinite number of diam-eters and one of them will be…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-96-191.webp)
