Waterlining was the cartographer's favorite water marking device during all the XIX and part of the XX centuries, although cartographers had little to do with it. Rather, it was the responsibility of the copperplate engraver. The craft was highly specialized and very well paid until the early 1900s, when screen printing become widespread. Today computers can revive the technique, at speed and costs no engraver could possible match. The illustration below is an example, a small section of a waterlined River Tyne, courtesy of Heritage Cartography, Newcastle-upon-Tyne, UK. You'll find other examples and applications of computer waterlining in the NEXT pages