{"collection":"aor","html_url":"https://unchartedknowledge.5gfusion.net/browse/aor/dv/0518.htm","path":"aor/dv/0518.htm","source_url":"https://sacred-texts.com/aor/dv/0518.htm","text":"The Da Vinci Notebooks\nIn proportion to the number of times that a b goes into c d will it be more luminous than c d. And similarly, in proportion as the point e goes into c d will it be more luminous than c d; and this light is useful for carvers of delicate work. 246\n259:246 5: For the same reason a window thus constructed would be convenient for an illuminator or a miniature painter.\n259:247 : M. RAVAISSON in his edition of the Paris MS. A remarks on this passage: \"La figure porte les lettres f et g, auxquelles rien ne renvoie dans l'explication; par consequent, cette explication est incomplete. La figure semblerait, d'ailleurs, se rapporter a l'effet de la reflexion par un miroir concave.\" So far as I can see the text is not imperfect, nor is the sense obscure. It is hardly necessary to observe that c d here indicate the wall of the room opposite to the window e and the semicircle described by f g stands for the arch of the sky; this occurs in various diagrams, for example under 511. A similar semicircle, Pl III, No. 2 (and compare No. 149) is expressly called 'orizonte' in writing.","title":"Vol. I: IX. The Practice of Painting: 518.","type":"page"}