A text-book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained .. (1850)
Minifie, William, 1805-1880. [from old catalog] · Baltimore, W. Minifie & co. · leaf 236
alwaystaking care to cover with a tint all the parts of the object that require thattint; by this means you will avoid harsh outlines and transitions, and giveyour drawing a soft agreeable appearance. Note 2.—The lightest part of a circular object is where a tangent to thecurve is perpendicular to… … Flate 56.SHADOWS. L .3
