Walker, William, b. 1821 · New York : C. Scribner · leaf 92
iece of stiff W paper and laid on thedrawing; then the offending dark part may be removedwith bread or artists gum (india rubber), and the lightthus made stippled up to the required shade. In j^en-work the knife must be used for scraping down any darkpatches. 109. Gradation.—The second exercise in… … similar to the first, but more difficult : for an oblong mustbe filled in with a perfectly even but graduated tint, thechange from light at one end todark at the other being hy imper-ceptible degrees, like the shade ona chalk cylinder or on an Qgg. The power of graduatingdelicately is very…
Drawing -- Study and teaching
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