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Arcane Relics of Forgotten Machinery
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Early telegraph transmitting handwritten messages mechanically
  • 2. Victorian device for binocular depth illusions from twin images
  • 3. Ancient communication conduit powered by compressed air
  • 4. Defunct miniature firearm designed for concealed personal defense
Down
  • 5. Pre-phonograph apparatus tracing sound waves on soot-coated paper
  • 6. Arcane contraption once used to detect fraudulent medical devices
  • 7. Pre-digital telewriting machine transmitting pen strokes remotely

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