A treatise of painting . fbme fixd Point, as F, and obfervingin what Places they cut the fame fuppofed Wall,MN\ that you may be afterwards enabled tofet them off on the real one: By this Means,you will find all the Heights, Jut tings out, andthe feveral remarkable Points in your Figure :as to the Breadths and Thicknefies, thole which3re projected on the ftraight Wall MN, willbe found in their due Dimenfions, the Figurebeing fufficiently diminilhed, by its diftartcefrom the Wall: But, that part of the Figurewhich enters the Curviture of the Arch, mufthave its Breadths and Thicknefies further di
A treatise of painting . fbme fixd Point, as F, and obfervingin what Places they cut the fame fuppofed Wall,MN\ that you may be afterwards enabled tofet them off on the real one: By this Means,you will find all the Heights, Jut tings out, andthe feveral remarkable Points in your Figure :as to the Breadths and Thicknefies, thole which3re projected on the ftraight Wall MN, willbe found in their due Dimenfions, the Figurebeing fufficiently diminilhed, by its diftartcefrom the Wall: But, that part of the Figurewhich enters the Curviture of the Arch, mufthave its Breadths and Thicknefies further dimi-nifhed, in the fame Manner as if it were ftraight \and to proceed the more furely, it may be con-venient to mark out this Diminution, on fomeeven Plane, where yon may lay your Figure,taken off from the feignYl Wall, N R, to be af-terwards Transferrd in its jull Proportions tothe Real Wall. This is a Method, which 1 dareventure to recommend as the belt, and themoltfccurCj that can be usd on the ll* Occalions. Qbferve,. & / . By Leonardo da Vinci. 15$ Obferve, that where your Shadows termi-Rcmarks rcnatc, there be always an Appearance of a halfIatI§ to^Shadowy that is, a mixture of Light and Sha-S^dwasdow -, and that the Shadow be more perfectlymingled with the Light, as it is further remo-ved from the dark Body which projects it. Nowthat Colour of a Body is never fcen fimple \ this1 have already proved, on this Principle-, thatthe Surface of every Body partakes of the Co-lour of its Object:, even though it be the Sur-face of a Tranfparent Body, as Water, Air, orthe like : For Air borrows Light from the Sun,and darknefs from the upper Regions, and fur-ther,it is fecn tinged with as many dirferentD/a,as there are are different Colours between which,and the Eye it is interpofed. Now though theAir, like Water, and other tranfparent Bodies,has no Colour of its own •, yet the moift Va-pours emitted from the Earth, and received in-to the lower Regions of the Atmofphere,thickening
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Keywords: ., bookauthorleonardodavinci14521519, bookdeca, booksubjectpainting
