Excerpt from A Manual of Elementary Problems in the Linear Perspective of Form and Shadow; Or the Representation of Objects as They Appear, Made From the Representation of Objects as They Are: In Two Parts; Part I. Primitive Methods; With an Introduction; Part II. Derivative Methods; With Some Notes on Aerial Perspective
In pencilling a drawing which is to be inked, use a pencil sharpened on a fine file, to a thin edge, rather than a round point, since it will thus keep sharp much longer.
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