SWEEPNIK was a device designed by Otto Frisch that used a sweeping laser to follow bubble chamber tracks. It was later used to follow roads as an aid to the digitisation of maps.
References
↑"Cambridge Physics - Sweepnik". Cambridge Physics, part of the Cavendish Laboratory Educational Outreach website for schools and the public. Archived from the original on 20 June 2006. Retrieved 16 December 2008.