St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 370
ig. 30., the rectanglewhich encloses it will become a square, and the curve willhave four points of contact, a b c d, B in the middle of the sides of thesquare. Draw the square, and as a squaremay be drawn about a circle in anyposition, draw it with its nearestside, E G, parallel to the sight-line.… … H P B Q P 7 y^ ^\ \ to E G. Then the points a b c d are the foui points of thecircles contact. On E G describe a half square, e l ; draw the semicircle kA L ; and from its centre, b, the diagonals r e, r g, cutting thecircle in x, y. 42 THE ELEMENTS OF PERSPECTIVE. From the points x y, where the…
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![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-96-192.webp)
