CrosswordMint
Arcane Reliquaries of Forgotten Tech
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Early analog recording medium shaped like an engraved tube
  • 5. Tabulation machine named after its inventor, ancestor of computing
  • 7. Mid-century image projector using oil film modulated by light
Down
  • 2. Naval signal lamp employing compressed air, obsolete semaphore variant
  • 3. Pre-digital apparatus for creating photos from negatives
  • 4. Victorian-era device transmitting dots and dashes electrically
  • 6. Obsolete type of early 20th-century recording medium (hint: sounds like ancient relic)

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