Is chinagraph still used?
Last time I saw one used in anger was down the hole at UKWMO Fiskerton or Horsham. {Yes I know they are far apart, but this was a long time ago]
After 48 hours of mock nuclear exchanges [which begin to be believable from lack of sleep] I watched some bastard plotter put the mockers on Yately: my home at the time.
Nasty