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Cryptic Relics of Historic Correspondence is a hard crossword puzzle with 10 clues covering . Play it online for free below, or create your own crossword with our free crossword maker.

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Cryptic Relics of Historic Correspondence
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Flickering light patterns substituting raised dots for illiterate night communication
  • 2. Resonant beats conveying coded messages through jungle or savanna
  • 3. Obsolete communication using recorded signals on thin bands of plastic—sound or data?
  • 6. Ancient device capturing voices on wax, predating magnetic tapes
  • 9. Pre-internet teleprinter system once vital for global dispatches
Down
  • 4. Chain of towers flashing messages with shutters, long before electronic telegraphs
  • 5. Feathered courier returning reliably to its roost, used before electronic mail
  • 7. Auditory signals using pitch changes for covert communication across ravines
  • 8. Dot-and-dash cipher cracking messages in early telegraphy
  • 10. Visual messenger waving flags in coded rhythm across distances
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