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Arcane Instruments of Ancient Precision
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Instrument for measuring angles, from the Greek for 'corner'
  • 2. Crown-shaped barbette once used to gauge arc spans
  • 4. Tool measuring altitude from boiling point observations
  • 5. Ancient traveler’s gear counting miles from footsteps or rotations
  • 6. Celestial analog calculator once essential for mariners' latitude
  • 7. Timepiece harnessing stars to tell nocturnal hours
  • 9. Obsolete length unit, once a tenth of a meter measure
  • 13. Hand-span related unit used for quick height approximation
Down
  • 3. Precision clock revolutionizing longitude determination at sea
  • 8. Fossilized shell used by ancient cultures as volume reference
  • 10. Rare device once used to measure loudness or sound levels
  • 11. Royal arm’s length standard vital to ancient builders
  • 12. One-fourth circle device for lunar distance measurements
  • 14. Obscure device for measuring snow thickness in alpine studies

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