EVELYN, John, Sculptura: Or, The History, And Art of Chalcography And Engraving in Copper. With an ample enumeration of the most renowned Masters, and their Works. To which is annexed A new manner of Engraving, or Mezzo Tinto, communicated by his Highness Prince Rupert, to the Authour of this Treatise, London, G. Beedle, 1662.1 quotations
The pen is therefore both the first, and best instructive, and has then (as all the other kinds) attain’d its desired end, when it so deceives the eye by the Magic, and innocent Witch-craft of lights and shades, that elevated, and solid bodies in Nature, may seem swelling, and to be embossed in Plano, by Art.
To arrive at this, you must first draw the exact lineaments, and proportion of the subject you would expresse in profile, Contours and single lines only ; and afterwards, by more frequent, and tender hatches in the lighter places, strong, bold, or cross in the deeper.