A text book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained (1849)
re 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 the ray as at… … Fn/. I.
