For a further variation in effect, a drawing may be executed in crayon or pencil on a fairly smooth paper previously pressed into close contact with any rough surface, such as sandpaper or canvas. The unsized side of a canvas for oil painting, or the cover of a book, will answer the purpose; openness of work, and the amount of ultimate reduction desirable, being depended upon and controlled accordingly.
The following sketches, by Mr. C.J. Vine, on Michallet and Lallane papers (pp. [111,] [113,] [115,] [117]), are pure untouched crayon work, reproduced by zinc line etching, so that these drawings may be safely entrusted to this cheapest and least sympathetic process; though there can be little doubt that the swelled gelatine would render fuller justice to work of this class.
CHAPTER XII.
MECHANICAL AIDS TO DRAUGHTSMANSHIP—DRAWING AND SKETCHING FROM NATURE.
The various methods whereby illustrations may be made for reproduction have now been reviewed, if not exhaustively, at least with sufficient completeness to enable the reader to start making those actual experiments in practice without which the most exact description is useless.
But thus far, with the exception of such cases in which it is possible to use a photogram and reproduce it by "half-tone" process, some ability to draw, some certain amount of native artistry on the part of the student, has been taken for granted.