Imitative art;, or, The means of representing the pictorial appearances of objects, as governed by aerial and linear perspective: : being a manual of details, for the amateur sketcher and the man of business, with a chapter on finish. (1840)
Howard, Frank, 1805-1866, Darton & Clark, publisher, J. Green and Co., printer · London : Darton and Clark, Holborn Hill. · leaf 74
60 THE APPLICATION OF THE power and the spectator^ from whence it will graduate into a half-tint^ softened by a delicate reflection on the outline nearest the source of lights and subsiding into a deep shadow^ also softened by a reflection on the side opposite to, or turning from the light. The… … of a lozenge form, more or less depressed as it is nearly on a level with or much below the eye. The light wdll graduate into a half-tint from the corner in front. Both sides will diminish in height as they recede, the upper and lower lines being drawn to the same point which, as before stated,…
Drawing · Perspective · Shades and shadows · Surfaces · Drapery in art · Projection
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Diuina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia, prospectiua, pictura sculpura, architectura, musica, e altre mathematice, suauissima, sottile, e admirabile doctrina consequira e de lectarasso co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-diuinaproportion00paci-291-0.webp)
