The image above is a detail from an illustration by Sidney Paget for Conan Doyle's "The Final Problem" (The Strand Magazine, December 1893).
I'm wondering if every one of those little dots and lines had to be drawn manually, or whether some type of mechanical device was used to decrease the tedium. Certainly the variation in size and shape and position suggest meticulous handwork, but the amount of labor required to produce the full image -
- boggles the mind. And this is interesting:
A complete set of Strand issues featuring the illustrated Sherlock Holmes tales is one of the rarest and most expensive collector's items in publishing history. Paget's original 10.5 x 6.75 inch drawing of "Holmes and Moriarty in Mortal Combat at the Edge of the Reichenbach Falls" was sold by Sotheby's in New York on 16 November 2004 for $220,800.Addendum: for the best answer re the original artist's technique, see BJ Nicholls' comment.